Test Configuration and Settings

For our testing, we used the following system.

Memory Benchmarking System Configuration
CPU Intel Core i7-2600K (Stock with Turbo Boost enabled: 3.5GHz - 3.8GHz)
Motherboard ASUS P8P67 Pro - BIOS version 1502
Memory Patriot Viper Extreme Division 2 4GB (2x2GB) DDR3-2133 Kit
Graphics MSI GTX 580 Lightning - Stock clocks (832MHz/1050MHz)
SSD OCZ Agility 2 120GB
PSU Corsair HX850 Power Supply
OS Microsoft Windows 7 Professional 64-bit

You’ll notice that we list only one specific set of memory; I don't have specifically rated modules for each of the memory speeds tested. Instead, I used a pair of DDR3-2133 modules that worked flawlessly at all of the lower speeds. Thanks to Patriot for supplying the DDR3-2133 4GB kit used for today's testing. To ensure my results weren't skewed, I tested a pair of DDR3-1600 CL9 modules against the DDR3-2133 CL9 modules running at the lower DDR3-1600 CL9 speed. The results of this test were identical. There may be minor variations between memory brands, but as a baseline measurement of what to expect our testing will be sufficient. We then used the following clock speeds and timings:

Tested Memory Speeds
DDR3-1333 7-7-7-18-2T
8-8-8-18-2T
9-9-9-18-2T
DDR3-1600 7-8-7-21-2T
8-8-8-21-2T
9-9-9-21-2T
DDR3-1866 8-9-8-24-2T
9-9-9-24-2T
DDR3-2133 9-11-9-27-2T

Testing Procedures

Each of the tests were performed three times with the average of those three runs used for the final results. However, there were a few exceptions to this. First, PCMark 7 was only ran once because it loops three times before providing its score. Second, the x264 HD Benchmark was only ran once because it looped four times in a single run. Third and finally, the LINPACK Benchmark was looped twenty-five times because it was also used to test for stability. And with that out of the way, let’s get to the test results.

Investigating Sandy Bridge Memory Scaling AIDA64 Memory Benchmark
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  • vailr - Monday, July 25, 2011 - link

    No discussion of differing voltages?
    A quick check for DDR3 at Newegg shows:
    G.SKILL ECO Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
    @ 1.35 volts & Cas Latency: 7
    vs.
    G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
    @ 1.50 volts & Cas Latency: 6
    A more thorough consideration of these two DDR3 modules might be interesting.
    For virtually the same money, aren't most people going to seek out DDR3 with the lowest possible CAS latency number, and also combined with the lowest possible voltage design?
    I know that: I wouldn't consider buying any DDR3 memory modules with a (nominal) CAS latency higher than 7.
    Reply
  • JarredWalton - Monday, July 25, 2011 - link

    Just as we didn't test with ten different modules (for ease of testing), we didn't use different voltage memory. Whether your RAM is 1.5V or 1.35V, at the same timings and speed the performance should be identical (less than a 0.5% difference). And we did look at the effect of lower latency RAM; sure, at the same price buy lower latency and higher bandwidth RAM, but prices aren't the same, particularly on 2x4GB kits. Reply
  • Tchamber - Monday, July 25, 2011 - link

    I'd like to see how these tests stack up against the tripple channel nehalem i7's. Reply
  • duploxxx - Monday, July 25, 2011 - link

    compare with what an EOL platform? it was alreay known that there is no added value with memory speed testing on these systems, just like the previous gen., 1366 is dead testing has been done in the past
    This test just showed that it is a lot of wasted money and time investigated in this.

    They better take the time and investigate further into Liano memory speed, something that really does scale with memory.
    Reply
  • Finally - Monday, July 25, 2011 - link

    It's already done, see Computerbase... Reply
  • JarredWalton - Monday, July 25, 2011 - link

    We've done it as well for graphics applications:
    http://www.anandtech.com/show/4476/amd-a83850-revi...

    We haven't done the application testing with different DDR3 on Llano, however.
    Reply
  • banwell - Monday, July 25, 2011 - link

    You can also get a nice 'free' bump in performance at 1600 by switching to 1T. Something the better quality memory will be able to do easily. Reply
  • AssBall - Monday, July 25, 2011 - link

    I'm not sure why they didn't test 1T . It is a memory scaling article after all. Anyway TechReport did and their conclusions are about the same, I.E. unless you are overclocking and running synthetic benchmarks, it doesn't really matter. Reply
  • compudaze - Monday, July 25, 2011 - link

    Lowering the command rate from 2T to 1T at DDR3-1600 doesn't necessarily mean you can do the same at DDR3-2133. Not all memory modules, CPU's and motherboards are creased equal. Testing all configurations at 2T kept the results comparable. Reply

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