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Mix two DDR3 kits with different voltages


First poster here. I bought a second memory kit advertised (mistakenly) as KHX1333C7D3K2/4G ( , this is the one I have right now in my PC) when in fact it was KHX1333C7D3K2/4GX ( , the same kit but with XMP support and different voltage.

Now, the kit I have installed in my PC its 1.7v and the new kit (the XMP one) its 1.65v. I don't plan to overclock. Does anybody know if I can mix the kits? my mobo is a GA-890GPA-UD3H.

Thanks in advance.
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  1. Best answer
    It should work. You should begin by setting the RAM voltage to 1.65V in the BIOS, then save the settings and exit the BIOS screen. The system will re-start.

    At that point I would boot to run memtest86+, testing one stick of RAM at a time. If all pass, then test them all together. If memtest86+ fails at the 1.65V setting, try increasing the RAM to 1.7V and run memtest86+ again.

    After all 4 sticks of RAM pass memtest86+, boot to the OS and run whatever you do for system tests and benchmarking.
  2. Thank you treefrog07. I installed them and so far everything is ok.
  3. Best answer selected by ogalonzo.
  4. You are welcome.
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