memory bandwidth calculator ddr3

Some personal computers and most modern graphics cards use more than two memory interfaces (e.g., four for Intel's LGA 2011 platform and the NVIDIA GeForce GTX 980). But if you don't know a lot about memory, the numbers can be confusing. In systems with error-correcting memory (ECC), the additional width of the interfaces (typically 72 rather than 64 bits) is not counted in bandwidth specifications because the extra bits are unavailable to store user data. The "6400" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 6400MB/s, or 6.4GB/s. When referenced by the industry name, the numbers that follow "PC" and the generation refer to the total bandwidth of the module. Skylake also easily eclipses Haswell and Ivy Bridge-E. DDR3 latencies are numerically higher because the I/O bus clock cycles by which they are measured are shorter; the actual time interval is similar to DDR2 latencies, around 10ns. Benefits. [1], In February 2005, Samsung introduced the first prototype DDR3 memory chip. You can calculate the time interval between clock ticks with. Where can I find a clear diagram of the SPECK algorithm? Remember that there are 8 bits in 1 byte. What does 'They're at four. Now able to calculate both system and GPU bandwidth. DDR4 memory is the latest generation of memory for computing applications and offers many benefits over previous generations of memory includinglower latencies, higher speeds, and more. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Thus, DDR-400 is called. EarthDog said: Its DOUBLE DATA RATE and Quad pumped. Is 4e-10 faster at tRAS (this variance is seriously negligible but worth noting). Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? x32, x64, x72. DDR4 speeds start at 2400 MT/s and offer faster speeds and responsiveness than all other generations of memory. Another benefit is its prefetch buffer, which is 8-burst-deep. For double-data-rate memory, the higher the number, the faster the memory and higher bandwidth. Quad Channel architecture such as those supported on Xeon E5 and Opteron 6200 platforms increases memory bandwidth by up to 35% over previous Triple Channel architecture. Bus width: 256-bit The actual DRAM arrays that store the data are similar to earlier types, with similar performance. First, while Skylake's instructions-per-clock gains are a little underwhelming, its memory controller is something else entirely. So, if you have any DDR memory that is, say, 1600Mhz. In Gen2 DDR3 server platforms (Gen 2 DDR3, circa 2012), controllers became aware of the physical ranks behind the data buffer. What is Wario dropping at the end of Super Mario Land 2 and why? This is the lowest speed DDR3, and the highest in the DRR3-12800, with 1600 million per second bandwidth at 12800 MBps. This will give you the memory bandwidth in mbps. A minor scale definition: am I missing something? It is used in many Pentium II, Pentium III, AMD K6-III, AMD Athlon, AMD Duron, and Power Mac G4 systems. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 125MHz has been replaced by PC133, which is backward-compatible. RAM running at 1 GHz "ticks" 1,000,000,000 (a billion) times a second. You can never have enough memory bandwidth, and DDR5 helps feed that insatiable need for speed. [2] Products in the form of motherboards appeared on the market in June 2007[14] based on Intel's P35 "Bearlake" chipset with DIMMs at bandwidths up to DDR3-1600 (PC3-12800). While the typical latencies for a JEDEC DDR2-800 device were 5-5-5-15 (12.5ns), some standard latencies for JEDEC DDR3 devices include 7-7-7-20 for DDR3-1066 (13.125ns) and 8-8-8-24 for DDR3-1333 (12ns). Additional DIMMs will force the memory to clock down to 1333MT/s. [26] Serial presence detect (SPD) is a standardized way to automatically access information about a computer memory module, using a serial interface. [15] The Intel Core i7, released in November 2008, connects directly to memory rather than via a chipset. STREAM Benchmark FAQ: Counting Bytes and FLOPS: Learn how and when to remove this template message, http://www.cs.virginia.edu/stream/ref.html#counting, https://en.wikipedia.org/w/index.php?title=Memory_bandwidth&oldid=1094989511, This page was last edited on 25 June 2022, at 19:29. Bus width: 352-bit [5] (The same timescale for market penetration had been stated by market intelligence company DRAMeXchange over a year earlier in April 2007,[6] and by Desi Rhoden in 2005. Memory bandwidth is usually expressed in units of bytes/second, though this can vary for systems with natural data sizes that are not a multiple of the commonly used 8-bit bytes. [16] DDR3 SO-DIMMs have 204 pins. DDR4 latency is a bit higher than DDR3, but not catastrophically so. Adding a 2x2GB RAM kit to a different 2x2GB kit - will performance be hurt? Do you work for Intel? DDR5 ECC RAM: 72 or 80 bit (I'm not asking about on-die but traditional fully fledged ECC) . [quotemsg=18132407,0,2259571]Let say I have a single CPU namely 5930K. In fact, it's only when you're making the C16 to C18 jump that overall latency starts to creep up, but that's solved almost immediately by just going to the next speed grade. These are intended to provide insight into the memory bandwidth that a system should sustain on various classes of real applications. The "official" name for DDR memory is based on its bandwidth rather than clock speed. When we calculate them, we are assuming that a data transfer will occur at each clock cycle (i.e., on a DDR3-1333 memory . [11]:109. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Second, DDR4 just doesn't have the latency issues the transition from DDR2 to DDR3 did. produced by RAM manufacturers, DDR2 memory is physically incompatible with the previous generation of DDR memories. Find the timings for you RAMCalculator: https://docs.google.com/spreadsheets/d/1aVCCySMQMw_VDjA3eXVR3K1A8yAQoGFaYOYiPSyhFRs/edit?usp=sharingPresentation: htt. There were situations where DDR3 could be faster than DDR2 during that transition, but DDR4 is a different animal. The number after the generation refers to the component's data transfer rate per second (/s). 3. While DDR4 DIMMs top out at 3.2 gigatransfers per second (GT/s) at a clock rate of 1.6 gigahertz (GHz), initial DDR5 DIMMs deliver a 50% bandwidth increase to 4.8 GT/s. TechSpot is about to celebrate its 25th anniversary. The number after these DDR3 chips shows different speeds, expressed in megahertz (MHz) or mega transfers. PC2700 is backward-compatible for PC1600 and PC2100. Super User is a question and answer site for computer enthusiasts and power users. To get this in GB/s which is how the memory bandwidth is usually displayed as, you need to divide by 8 to get the answer in MB/s and then divide by 1000 to get the answer in GB/s. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But I don't under stand why. [2][3] In May 2005, Desi Rhoden, chairman of the JEDEC committee, stated that DDR3 had been under development for "about 3 years". <64 IOs. TechSpot means tech analysis and advice, Best 1440p Gaming Monitors: Budget, Premium & 360Hz, Study identifies which countries spend the most time staring at their screens, PlayStation 5 more than doubles Xbox Series shipments, Meta's Reality Labs lost $4 billion last quarter, for a total of $30 billionsince 2020. So your effective transfer rate (assuming DDR3 tech) 1333Mhz * 64bit/ (8bits/byte) = 10666MB/s (also classified as PC3-10666) The 1333Mhz already has the 2 transfer/clock factored in. . DDR3-xxx denotes data transfer rate, and describes DDR chips, whereas PC3-xxxx denotes theoretical bandwidth (with the last two digits truncated), and is used to describe assembled DIMMs. Each clock two bits can be transferred between the I/O Bus and the memory controller, and with DDR4 16 bits per clock between the storage array and IO bus. 2x DDR3. You must log in or register to reply here. Please sign me up for emails from Kingston about its products, services and news. Supports DDR1, DDR2, DDR3, DDR4, as well as single through to quad channel configurations. Editor's note: Guest author Dustin Sklavos is a Technical Marketing Specialist at Corsair and has been writing in the industry since 2005. Note also that Haswell's memory controller has a hard time going past 2400MHz, which really has been the performance sweet spot in DDR3. Find the memory you need or contact a Kingston expert for help. Simple deform modifier is deforming my object, Passing negative parameters to a wolframscript, Extracting arguments from a list of function calls. Cycle time is the inverse of the I/O bus clock frequency; e.g., 1/(100MHz) = 10ns per clock cycle. In practice the observed memory bandwidth will be less than (and is guaranteed not to exceed) the advertised bandwidth. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thanks for contributing an answer to Stack Overflow! @MissLucy I'm not sure what you mean by "memory margin". This advantage is an enabling technology in DDR3's transfer speed. We recommend that you use either the Crucial Memory Advisor or Crucial System Scanner to find the right memory for your computer. Those 64 bits are sometimes referred to as a "line" Number of interfaces: Modern personal computers typically use two memory interfaces (dual-channel mode) for an effective 128-bit bus width - . 21-C (JESD21C: JEDEC configurations for solid state memories), This page was last edited on 7 January 2023, at 21:56. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. DDR4 SDRAM (Double Data Rate Fourth SDRAM): The easy method to convert data rate to bandwidth is to multiply by eight. I see notes of around 800 Mega Bit per second, is this true? To learn more, see our tips on writing great answers. UniDIMMs have the same dimensions and number of pins as regular DDR4 SO-DIMMs, but the notch is placed differently to avoid accidentally using in an incompatible DDR4 SO-DIMM socket.[18]. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Modern computers use 64 bit wide memory buses. Calculate your computers memory bandwidth quickly and easily. So the Memory Bandwidth = 16 x 1313 MHz x 384 = 8067072 mbps. DDR-200 - Memory Clock = 100 MHz, I/O Bus Clock = 100 MHz; DDR2-800 - Memory Clock = 200 MHz, I/O Bus Clock = 400 MHz; DDR3-1600 - Memory Clock = 200 MHz, I/O Bus Clock = 800 MHz; DDR4-3200 - Memory Clock = 400 MHz, I/O Bus Clock = 1600 MHz Could someone please explain what is memory clock and I/O bus clock here? The DDR3U (DDR3 Ultra Low Voltage) standard is 1.25V and has the label PC3U for its modules. [4]) The primary driving force behind the increased usage of DDR3 has been new Core i7 processors from Intel and Phenom II processors from AMD, both of which have internal memory controllers: the former requires DDR3, the latter recommends it. All rights reserved. Compared to DDR2 memory, DDR3 memory uses less power. Also, will a 2x4gb DDR3 SDRAM 1600MHz with a timing of 8-8-8-24 be better than both of the previously mentioned? 3 to JESD79-3 - 3D Stacked SDRAM, SPD Annex K - Serial Presence Detect (SPD) for DDR3 SDRAM Modules (SPD4_01_02_11), https://en.wikipedia.org/w/index.php?title=DDR3_SDRAM&oldid=1132228525, All articles with bare URLs for citations, Articles with bare URLs for citations from March 2022, Articles with PDF format bare URLs for citations, Creative Commons Attribution-ShareAlike License 3.0, Support of system-level flight-time compensation, Introduction of CWL (CAS write latency) per clock bin, Dynamic ODT (On-Die-Termination) feature allows different termination values for Reads and Writes, Fly-by command/address/control bus with on-DIMM termination, Higher bandwidth performance, up to 2133 MT/s standardized, Slightly improved latencies, as measured in nanoseconds, Higher performance at low power (longer battery life in laptops), JEDEC standard No. pins and 100+ grounds. When compared to an RDIMM solution on fully populated 24 slot systems operating at the same speed, LRDIMM provided only 70% of the memory bandwidth. Latency continues to improve past 2400MHz, but memory bandwidth takes a . The effective memory clock is simply the normal memory clock multiplied by the number of times data can be sent per clock cycle. The memory copy operations look basically the same as the read operations. PC2-8000 is backward-compatible for PC2-4200, PC2-5300, and PC2-6400. PC3200 is backward-compatible for PC1600, PC2100, and PC2700. With data being transferred 64 bits at a time per memory module, DDR3 SDRAM gives a transfer rate of (memory clock rate) 4 (for bus clock multiplier) 2 (for data rate) 64 (number of bits transferred) / 8 (number of bits in a byte). // See our complete legal Notices and Disclaimers. With all that in mind, we compared Intel's Ivy Bridge-E (quad-channel DDR3), Haswell (dual-channel DDR3), Haswell-E (quad-channel DDR4), and Skylake (dual-channel DDR4) at a variety of speed grades in synthetic testing in AIDA64 to isolate raw memory bandwidth. // Performance varies by use, configuration and other factors. Is it safe to publish research papers in cooperation with Russian academics? Adding more memory to your PC is one of the best and easiest ways to improve system performance. But now your mentioning of two bits per pin is confusing me more. The "1600" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 1600MB/s, or 1.6GB/s. Memory frequency refers to the number of commands or transfer operations that the memory module can handle per second. 2023 Kingston Technology Europe Co LLP und Kingston Digital Europe Co LLP, Kingston Court, Brooklands Close, Check out the wiki page for more info: http://en.wikipedia.org/wiki/DDR3_SDRAM GPUSpecs.com is a participant for the amazon associates program. for DDR3 and DDR4 only around 2 Gbps. Memory bandwidth is the rate at which data can be read from or stored into a semiconductor memory by a processor. What "benchmarks" means in "what are benchmarks for?". RAM doesn't just have one single lane to send data. Thats about a 17% improvement on memory bandwidth over DDR3-1333. In servers, the processor model number affects how fast the memory can operate. When you go back to BIOS, you can find Memory Force bar became shorter, compared to XMP 3600MHz and stock 2666MHz. The DDR3@1866 has the higher transfer rate (14928MB/s vs 12800MB/s), and as you will see, the chips both have pretty much equal advantage on each other in terms of timings. DDR3 SDRAM is neither forward nor backward compatible with any earlier type of random-access memory (RAM) because of different signaling voltages, timings, and other factors. View Details Launch Part Catalog. 1 to JESD79-3 - 1.35 V DDR3L-800, DDR3L-1066, DDR3L-1333, DDR3L-1600, and DDR3L-1866", "Addendum No. Connect and share knowledge within a single location that is structured and easy to search. DDR5 memory bandwidth is initially at 4.8 Gbps per pin, compared with DDR4's 3.2 Gbps. Commission may be earned on items purchased through links at GPUSpecs.com. In order to achieve the tested speed of 2133, you would need to manually adjust the memory speed settings. for a basic account. Then divide by 8 gives us 1008384 MB/s. 1600 MT/s x 64 bits / 8 bits/byte = 12800 MB/s, Oh, I think I was misinterpreting this graph. Nvidia RTX 4060 Ti specs confirmed by die shot and retail listing, Intel posts biggest quarterly loss in company history as processor sales plunge. Timings are given in clock ticks, so comparing the timings of a pair of chips of different frequency is an apples-to-oranges comparison, and requires some conversion. Double Data Rate 3 Synchronous Dynamic Random-Access Memory ( DDR3 SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) with a high bandwidth ("double data rate") interface, and has been in use since 2007. Under this convention PC3-10600 is listed as PC1333.[25]. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? An example of data being processed may be a unique identifier stored in a cookie. We appreciate all feedback, but cannot reply or give product support. You multiply that by 8 to get 14,000MHz effective clock speed. Memory bus (interface) width: Each DDR, DDR2, or DDR3 memory interface is 64 bits wide. Samsung played a major role in the development and standardisation of DDR3. The speed rating (800) is not the maximum clock speed, but twice that (because of the doubled data rate). The maximum theoretical bandwidth for that would be 12,800 MB/s. ', referring to the nuclear power plant in Ignalina, mean? . Memory type: GDDR5, (2002 * 256 / 8) * 4 = 256 256 MB/s = ~256 GB/s. In other words, it's a worthy successor. Samsung's DDR3 opens new possibilities for life experience. I'm not sure. The "2700" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 2700MB/s, or 2.7GB/s. Troubleshooting Steps When RAM Memory Is Not Detected. Skylake's exceptional ability to scale up in clock speed allows it to make up bandwidth and, at a high enough speed, put it in striking distance of Haswell-E. In addition to bandwidth designations (e.g. They both seem to use the same type of RAM (GDDR5 with a pump rate of 2), both running at 3 GHz. The "4200" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 4200MB/s, or 4.2GB/s. DDR3 1600 vs 1866 vs 2133 vs 2400: Key Differences. Thank you, Hazzit!I under stand that "memorybandwidth = clock_rate*memory_width. Sign up to our emails for Kingston news and more. SORDIMM. DDR DDR2 DDR3 DDR4 And DDR5 Memory Bandwidth By Generation 1. To find the memory information for any Intel Processor (Intel Core, Intel Pentium, Intel Celeron, Intel Xeon), follow the steps below: Find the supported memory for Intel Desktop Boxed Processor i9-11900KFIntel Core processor. DDR2 SDRAM, DDR3 SDRAM, DDR4 SDRAM. [34], JEDEC Solid State Technology Association announced the publication of JEDEC DDR3L on July 26, 2010[35] and the DDR3U in October 2011.[36]. Buy Xeon X5650 CPU, Six Core Twelve Threads 2.66GHz 12M Cache LGA1366 6.4 GT,s QPI 95W DDR3 800,1066,1333 SSE4.2 Maximum 3 Memory Channels Maximum 32GB,s Memory Bandwidth: CPU Processors - Amazon.com FREE DELIVERY possible on eligible purchases Yet there's no point where the wheels start to shake on Skylake's controller; it continues scaling, even up to and beyond 3600MHz. Actual throughput is limited by that number and will always be somewhat lower than this maximum. High-performance graphics cards running many interfaces in parallel can attain very high total memory bus width (e.g., 384 bits in the NVIDIA GeForce GTX TITAN and 512 bits in the AMD Radeon R9 290X using six and eight 64-bit interfaces respectively). You'll notice we jumped directly from C16 to C18; C17 isn't officially supported. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Some manufacturers also round to a certain precision or round up instead. This latency depends on a number of things and is really hard to calculate, and usually results in RAM systems delivering way less than their theoretical maxima. | Shop the latest deals! New Xeon E5 and AMD Opteron 6200 servers support up to 2 DIMMs per Channel (See table), DDR3-1600 effectively increases bandwidth over DDR3-1333 by about 17%. PC133 is backward-compatible for PC100 and 125MHz. You can select your preferred language independent from your country. To ensure that a certain brand and model of DRAM will work on a particular motherboard, check the motherboard's manual or contact your motherboard vendor for support. [8] The primary benefits of DDR4 compared to DDR3 include a higher standardized range of clock frequencies and data transfer rates[9] and significantly lower voltage. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can using 2 pairs of different speed of DDR3 ram (each in dual channel) cause any issues? We now have a mainstream, dual-channel platform capable of generating nearly as much memory bandwidth as last generation's quad-channel. Well handle your information in line with our privacy policy. Note that the memory speed/memory clock are the same thing on their website and are both measured in Gbps. A minor scale definition: am I missing something? Bandwidth is calculated by taking transfers per second and multiplying by eight. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Memory bandwidth theoretical calculation for GPU, How-to run TensorFlow on multiple core and threads. Connect and share knowledge within a single location that is structured and easy to search. [11]:157165All RAM data rates in-between or above these listed specifications are not standardized by JEDECoften they are simply manufacturer optimizations using higher-tolerance or overvolted chips. Then divide by 1000 to get 1008.34 GB/s. Manually overclocking DDR5 RAM on an MSI Z690-A motherboard ? FPM and EDO speeds are written in nanoseconds (ns), which indicates their access time; the lower the number, the faster the memory (it takes fewer nanoseconds to process data). Dell's Power Advisor calculates that 4GB ECC DDR1333 RDIMMs use about 4W each. Look at the memory specs instead (links in question above) Both are specified as "6gbps" meaning 3GHz * 2 (because DDR), "quad-pumped" buses that deliver four bits per tick, but I haven't heard of the latter being used on graphics cards => Look at PAM4 signaling over GDDR6X, How to get memory bandwidth from memory clock/memory speed, https://www.goldfries.com/computing/gddr3-vs-gddr5-graphic-card-comparison-see-the-difference-with-the-amd-radeon-hd-7750/, How a top-ranked engineering school reimagined CS curriculum (Ep. For a better experience, please enable JavaScript in your browser before proceeding. For your RAM, we end up with (these figures are rounded to the hundredth): So, by comparing the time, we can see that the 1866MHz chip: Has a 0.00000000035 second advantage in CAS Latency and RAS-to-Precharge, (9@933 is faster than 8@800), Is 0.0000000007 seconds slower than the 800MHz chip in RAS-to-CAS (8@800 is faster than 10@933). For example, PC3-10666 memory could be listed as PC3-10600 or PC3-10700. The following CAS latencies were used for each speed grade: One crucial thing to point out with DDR4 is that it has an oddball "CAS latency hole." This article was originally published on the Corsair blog. Asking for help, clarification, or responding to other answers. The "4200" refers to the module's bandwidth (the maximum amount of data it can transfer each second), which is 4200MB/s, or 4.2GB/s. In September 2012, JEDEC released the final specification of DDR4. Numbers shown in the I/O column represent the number of primary I/Os at the DDR3 memory interface. Free shipping! In general, as the frequency goes up, the time for a tick interval goes down (which is why faster RAM always seem to have higher timing values). Dont have an Intel account? The two primary measurements for performance in storage and memory are latency and throughput. Enter the processor number in the right-upper corner of the search box on the. 79-3 (JESD79-3: DDR3 SDRAM), SPD (Serial Presence Detect), from JEDEC standard No. 4x DDR4. Edit: I'll try to explain the whole concept a bit more: the following is a simplified model of the factors that determine the performance of RAM (not only on a graphics cards). It's also worth comparing four generations of memory controllers - two dual-channel and two quad-channel - and seeing what the weaknesses and strengths of each one are. Memory is designed to be backward compatible within its generation, so generally speaking, you can safely add faster memory to a computer that was designed to run slower memory. Work out whether or not your memory is a bottleneck, or find out just how much bandwidth you can get from overclocking. Even the Intel 4004 had a 4 bit bus. Asking for help, clarification, or responding to other answers. . PC2100 is used primarily in AMD Athlon systems, Pentium III systems, and Pentium IV systems. Memory bandwidth that is advertised for a given memory or system is usually the maximum theoretical bandwidth. Sign up here Now able to calculate both system and GPU bandwidth. However, this will also need to be supported by the motherboard. Two memory interfaces per module is a common configuration for PC system memory, but single-channel configurations are common in older, low-end, or low-power devices. where memory clock type multiplier is one of the following: HBM1 / HBM2: 2 DDR3-1600 memory has a module classification of PC3-12800, which effectively means the peak data rate of the module is 12.8GB/sec (see table). RAM is running at a clock speed. AMD's socket AM3 Phenom II X4 processors, released in February 2009, were their first to support DDR3 (while still supporting DDR2 for backwards compatibility). Next, tap or click on the Personalization button to turn on the chat feature, then Save. Give us a call, or installlike a pro using our videos and guides. Densities. How much memory can I declare as tile_static? Memory specified to DDR3L and DDR3U specifications is compatible with the original DDR3 standard, and can run at either the lower voltage or at 1.50 V.[32] However, devices that require DDR3L explicitly, which operate at 1.35V, such as systems using mobile versions of fourth-generation Intel Core processors, are not compatible with 1.50V DDR3 memory. We'll need to see how it handles DDR3L - and we'll be testing that in greater detail soon enough - but it has none of the scaling hiccups any of its predecessors have. Just how you would have done this with GDDR5. This is twice DDR2's data transfer rates (4001066MT/s using a 200533MHz I/O clock) and four times the rate of DDR (200400MT/s using a 100200MHz I/O clock). Intel technologies may require enabled hardware, software or service activation. MIP Model with relaxed integer constraints takes longer to solve than normal model, why? One thing to keep in mind is that memory needs to be the same type - memory modules are not forward or backward compatible in terms of generation types so DDR3 will not work in DDR2 or DDR4. FYI, Here are the specs I got from Nvidia, http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-680/specifications, http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-titan/specifications. The DDR3L (DDR3 Low Voltage) standard is an addendum to the JESD79-3 DDR3 Memory Device Standard specifying low voltage devices.

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