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DIfferences between these 2 Corsair memory sticks

Hello,

I am building an AMD system and I was looking at purchasing 4GB of Corsair DDR3 1600 memory. I looked the to below and noticed that on the box the one for $178 stated Phenom II and the one for $137 stated Intel I5 & I7 in the pictures see below from Newegg. The only thing that is different between the Two is a letter in the middle of the model # CMD4GX3M2A1600C8 for Intel and CMD4GX3M2B1600C8 for AMD. Is there a difference between these? Would it not be a good idea if I bought the intel ones for my AMD setup? I just dont understand why the AMD sticks are $40 more, when the specs are the exact same.

CORSAIR DOMINATOR 4GB (2 x 2GB) Phenom II $178
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145264

CORSAIR DOMINATOR 4GB (2 x 2GB) Intel I5 & I7 $137
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145265

Thanks for the replies.
7 answers Last reply Best Answer
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  1. Best answer
    Based on this page: http://www.corsair.com/products/dominator/default.aspx the A model supports Intel Extreme Memory Profiles (XMP).

    After double checking the New Egg listings, I see that it does state A supports XMP and B supports BEMP (Black Edition Memory Profile).

    If your're comfortable setting timings by hand I don't know why it would matter. However I'm not familiar with BEMP. Here's one explanation I found: http://www.hardwarezone.com.au/reviews/view.php?cid=2&id=2880&pg=2

    Googling around, there are others who bought the "wrong" RAM, such as this one: http://www.overclock.net/intel-memory/638214-bought-wrong-ram-bemp-instead-xmp.html

    Another indicates AMD hasn't actually enabled the BEMP for these modules yet (as of 12/09) http://www.overclock.net/amd-memory/621613-corsair-dominator-cmd4gx3m2b1600c8-amd-bemp.html

    Neither seemed to have a problem getting it running though.
  2. Thank you for the links, Very Helpful.
  3. Best answer selected by subaru41.
  4. The modules are different. Most users cannot run 1600 with the A version which is why we make a B version. The A version will run on your system but not likely at 1600. If you want a kit certified for 1600 on your system, you'll need the B version.
  5. What's wrong with the A version that most users can't get them to run at 1600?
  6. There is nothing "wrong" with the version. It's simply that the AMD memory controller does not like that particular IC. Intel will run both at 1600 so it's not the memory.
  7. Got it. Thanks.
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