1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Intel DDR2 FB-DIMM Performance

Michael Larabel

Published on 16 June 2006
Written by Michael Larabel
Page 12 of 12 - Comment On This Article

Will FB-DIMM have the same fate of RAMBUS RD-RAM? Likely not. Fully Buffered Dual Inline Memory Modules with its high-speed serial interface should prove to be an invaluable asset for mission-critical environments that require maximum performance and a low error rate, while it will likely be only a matter of time before measures are taken to deliver this same technology to desktop users. Servers using Fully Buffered DIMMs can now dramatically increase the number of modules in the configuration while also increasing the speed and reliability of the system memory. With the FB-DIMMs still in their infancy, require a greater number of PCB layers, and use an AMB controller chip, serialized memory is about 30% more expensive than standard DDR2. At the time of writing, the available selection of FB-DIMMs at the popular Internet retailers is also very limited; we would anticipate that additional manufacturers will begin offering their wares shortly.

Looking over the results from our tests performed, FB-DIMM memory is certainly capable of being the Speedy Gonzales of system memory. In fact, in many of the RAMspeed benchmarks, the FB-DIMM DDR2-533 was pretty much performing the same as non-ECC non-Registered DDR2-667. The higher memory bandwidth from FB-DIMMs will largely come when using a greater number of modules -- as we began to demonstrate in our second set of benchmarks. Meanwhile, the ECC Registered DDR2-400 and DDR-400 lagged behind the faster alternatives, but they remain good comparison values. When it came to the second set of tests that looked at the two versus four FB-DIMM memory occupancy and correlating these numbers to real-world performance, in Enemy Territory there was an evident gain while the performance delta in the other benchmarks were minimal.

To reiterate some of the features for FB-DIMMs is support for up to eight memory channels each with six modules, Cyclic Redundancy Check, bi-directional serial interface, and greater bandwidth. The process of upgrading memory has also been simplified with Fully Buffered Dual Inline Memory Modules, especially when it comes to being compatible with DDR3 FB-DIMMs. The downsides for this new memory adaptation are the increased heat output due to Advanced Memory Buffered (AMB) chip, and elevated costs. The heat output is approximately a few Watts per module, which has improved since the original FB-DIMM design. The cost of these modules should hopefully decrease with time and once higher volumes are shipped.

Though enthusiasts and desktop users should not look for this technology reaching their systems anytime soon, it may likely come down the road within the next couple of years. For now, Intel has been the only manufacturer to adopt this memory with their new Bensley platform, and according to a trusted and reliable source, it is not expected that Advanced Micro Devices will make the FB-DIMM jump anytime in the near future. Good-bye stub bus!

Feel free to discuss this article in our Phoronix Forums.

Look for additional articles on FB-DIMM Linux performance to come soon at Phoronix. A special thanks goes out to Tyan, Intel, and Kingston for their support with this article.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Even With Re-Clocking, Nouveau Remains Behind NVIDIA's Proprietary Linux Driver
  2. The Power Consumption & Efficiency Of Open-Source GPU Drivers
  3. AMD R600g/RadeonSI Performance On Linux 3.16 With Mesa 10.3-devel
  4. Intel Pentium G3258 On Linux
Latest Linux Articles
  1. Nouveau vs. Radeon vs. Intel Tests On Linux 3.16, Mesa 10.3-devel
  2. KVM Benchmarks On Ubuntu 14.10
  3. X.Org Server 1.16 Officially Released With Terrific Features
  4. Ubuntu With Linux 3.16 Smashes OS X 10.9.4 On The MacBook Air
Latest Linux News
  1. Grand Theft Auto Running On Direct3D Natively On Linux Shows Gallium3D Potential
  2. GCC As A Just-In Time Compiler Is An Interesting Project
  3. Age Of Wonders III Is Still Being Ported To Linux
  4. Git 2.1 To Further Mainline Windows Support Patches
  5. Debian 8.0 Jessie Is Settling For Linux 3.16
  6. Meson: A Next-Gen Build System Showing Promise
  7. Linux 3.16-rc7 Calms Things Down For The Linux 3.16 Kernel
  8. Open-Source AMD Users Report Hawaii GPU Acceleration Is Working
  9. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  10. Cauldron 2014: GCC & LLVM Will Look To Collaborate More
Latest Forum Discussions
  1. Linus Torvalds On GCC 4.9: Pure & Utter Crap
  2. Updated and Optimized Ubuntu Free Graphics Drivers
  3. Porting Mesa to the Playstation 2
  4. ASRock AM1H-ITX: One Of The Best AM1 Mini-ITX Motherboards
  5. Debian + radeonsi
  6. Open-source drivers on ATI R7 260X
  7. Table test
  8. How To Setup Radeon DPM On Ubuntu Linux