Wednesday, December 22, 2010

4 GB DDR3 modules. Updated – HighPerformanceSystems

These days I am doing some experiments with 4 GB DDR3 memory modules on a Core i7 930 at 4.2 GHz (181 MHz X23 Turbo Mode) for a total of 12 GB. In ProfessionalSAT, two articles detail some aspects of systems designed with these components (in Spanish, sadly I´m in the process of translation…):

3DIMM_4GB_DDR3_13333 DDR3 1333 DIMMs, 4 GB each.

The first and early conclusions are:

  • I can’t configure them as I normally do with their 2 GB counterparts. Timings of 7-7-7-14 1T on socket 1366 motherboards for Core i7 900 series are unreachable, in this case I only managed to reach 8-8-8-24 2T with full establility.
  • I also notice a higher thermal dissipation with 100% load. Temperature is really high on the surface of the memory chips, being recommendable direct air cooling.
  • Its maximum frequency with nominal 9-9-9-27 2T timings is 1500 MHz and is reached at 1.64V.

DSCF0522The chips are much greater in area than its 2 GB analogues.

This amount of memory (12 GB) helps greatly with Windows 7 X64, especially when compressing large volumes of data with 7zip in LZMA2 mode at 8 threads with large dictionary sizes. It is a task that I routinely run and the compression time decreases in a very remarkable way.

DSCF0521Detail of one of the chips.

Another possible use of this amount of memory for a user without that need for its software mix is to allocate 4 GB for a RAM disk (ramdisk) staying with 8 GB of memory for the operating system.

DSCF0523Kingston KVR1333D3N9/4G

No doubt we soon will see our systems populated by modules of this capacity when its price ratio lowers compared to the standard 2 GB ones.

When the memory manufacturers reach the next node in manufacturing, thereby reducing voltage and die area, we will be able to increase the frequency of these 4 GB DIMMs without any problems.

Link to my original post in Spanish at LowLevelHardware from Nov 3 2010.

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