Mixing Memory Question

Hey Guys, a few days ago it was about 2am and I was a few scotches deep and saw a sweet deal on some ram and pulled the trigger.

Issue is, as with much drunk shopping, I didn't look over the specifics too well and think I may have ordered memory that will not jive together (Different CAS and different stock voltages).

Haven't received it yet so I haven't had any real world testings as of yet, so i'm looking to see if any of you fellers/gals would like reassure me or berate me!?

This is what I'm working with, so whats the verdict?

Already have:


ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard



G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRM


The New Sticks:

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL

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  1. I am going to go out on a limb here, and say I think you are going to get away with that. As long as you don't mix the sticks in different channels. It all depends upon how picky your MB is; not all are equal.
    Neither set of sticks is on your QVL, but, of course, not all sticks are tested.

    You will almost certainly have to pull up the SPD table and time them yourself though.
  2. Keep the matched chips in the same channel and run both channels at the same speed you'll be fine unless you intend on setting any overclocking records.
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