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Two Dual Channel Compability


I currently have Asus P8P67 Pro MB with memory below

CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model TW3X4G1333C9A G

and I want to add these RAM

CORSAIR XMS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX4GX3M2B1600C9

The only difference is frequency (1333 and 1600 MHz)

If I put them together, will the second dual channel run at the first dual channel or the dual channels run independently?

If the 1600 will be downgraded to 1333, is it safe to OC the 1333 to 1600 first, then add the 1600?

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  1. Best answer
    When you mix and match the RAMs you'll get an intermediate speed.
    When you OC the RAM it's going to go upward equally on all the Slots, it's a gap that you can never close.
    Suggestion, especially since it's an Asus board, sell the 1333's and get another pair of 1600s.
  2. Thanks for the input. If that is the case, do you guys recommend to get
    2x4gb and having the other 2 slots open so I can upgrade later with another RAM when I need it?
    This case will probably cause the same issue as I have now though, lol.

    I am currently using the rig for daily activities and light gaming.. I just have too many tabs opened in Chrome and I need more RAM to compensate that..

    2x4gb seems to be the cheaper option as well..
  3. 2x4 price is just as cheap as 4x2 if not cheaper so its the better choice. you can always try to add your current set to the 2x4 and if it don't work you can sell them.
  4. Well, 2 X 4GB sticks would be a better option anyday since it allows for further upgrades, and no, I don't think you'll have the same problem that you're having now with the timings when you go in for another upgrade later 'cos these RAMs...4GB single slots isn't something a lot of people buy, it's not as common as the 2GB sticks. Thus the availability of the same model of the 4GB stick RAM is going to be the same even after a year..... most probably.
  5. Thanks for the reply all.
    I guess I am going to buy 2x4 GB first (1.5V !! 1600 Mhz and CAS 9 at least) , stick it inside my rig with 2x2gb and then sell my 2x2gb...
    Hopefully it is not hard to sell it on CL..
  6. Best answer selected by sayurann.
  7. This topic has been closed by Maziar
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