Asus P7p55D-E Pro compatible memory


I have purchased an Asus P7P55D-E Pro motherboard for a new build. As this is my first go at building a system from scratch any advice would be greatly appreciated.

The chip I will be getting is an Intel i5 760

The memory I want to get is 2x2Gb Corsair DDR3 1600 CL7

I have several questions.
Firstly; the memory does not appear in any of the Asus documentation/website as being compatible (the closest version that does is a higher latency CL9 version) but does state on the Corsair website as being compatible with this mobo. Who should I believe?

Secondly; In the mobo doucumentation it says:
"Due to Intel spec definition XMP DIMMs and DDR3-1600 are supported for one DIMM per channel only."
Does this mean that when I get a second set (so 4 x 2Gb in total) that It will not work at 1600?

And so, should I just bite the bullet and get some DDR3 1333 CL9 or stick with the 1600 CL7?

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  1. Quote:
    "Due to Intel spec definition XMP DIMMs and DDR3-1600 are supported for one DIMM per channel only."
    Does this mean that when I get a second set (so 4 x 2Gb in total) that It will not work at 1600?
    Welcome to Tom's Forums! :)

    In this case, the XMP set the BIOS for only (1) one set and if/when you add a second set (2) you'll need to simply set the DRAM Speed/Voltage and CAS timings. Frequently, I recommend that that XMP not be used; it's a dual edge sword - 'if' it works it works great otherwise it can interfere in posting or OC the CPU.
    Corsair Tested RAM -

    My suggestion with that CPU is the CORSAIR DOMINATOR 4GB (2 x 2GB) DDR3 1600 Model CMP4GX3M2A1600C8


    Your link the RAM is to the MOBO; if you 'meant' CORSAIR XMS3 4GB (2 x 2GB) DDR3 1600 (PC3 12800) Model CMX4GX3M2A1600C7 then they're okay and do off the XMP 'feature'. Just work off the Tested list to avoid problems.
  2. Thanks for your advice and sorry for the wrong link. If I go with your suggestion and 6 months later add another 2 x 2Gb It wont have any problems running 8Gb @ 1600 will it?
  3. Problems 'No' as long as they're the 'SAME Set', but you'll need to manually enter the RAM values as I've described. RAM prices just dropped 15%~25% in the past few days - therefore you 'might' want to consider getting a 2X4GB set now. However, I would strongly recommend that you open a ticket with Corsair - example:

    "Corsair Technical Support The CMP8GX3M2A1600C9 should be fully compatible with the P7P55D motherboard. Many of our 4GB module kits are fairly new and have not yet made it to our memory configurator, but these parts are definitely tested to run on the P55 chipset. 11/5/2010 7:40:21 PM"

    The ticket above was for an ASUS P7P55D-E Pro. 4GB modules are very picky, and a 2X4GB is more efficient than 4X2GB. Also, 4GB is fine for most 64-bit OSes and users, remember 32-bit OS you can only access ~3.5GB, and 8GB or more is beneficial for 'Rendering' Apps.
  4. So would a higher latancy (9-9-9-24-2T) 2 x 4Gb setup be better than lower latancy (7-8-7-20-2T) 4 x 2Gb setup?
  5. I wish it were 'that' simple. The CAS disparity suggests a poorer quality IC, and it might be as slow if not slower than a tight CAS. The correct answer is to Test them and see what they can do. The Dominator series easily OC and ... well see for yourself.

    Comparison Module #1: Mushkin Redline 996805 6-8-6-24 1600MHz
    Comparison Module #2: G.Skill Pi Series 7-8-7-24 1600MHz
    Comparison Module #3: Mushkin 998687 8-9-8-24 1866MHz
    Comparison Module #4: Corsair Dominator TR3X6G1600C8D 8-8-8-24 1600MHz
    Comparison Module #5: Kingston HyperX T1 9-9-9-27 1600MHz
    Comparison Module #6: Mushkin Blackline 998677B 7-7-7-20 1333MHz
    Comparison Module #7: Patriot Viper II Sector 7 9-9-9-27 1800MHz


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