Ram Compatibility Between Different DDR3 Memory Sticks

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gilbert.denis77

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I have 2x4GB Corsair DDR3 1600Mhz RAM...I would like to add on 2x8GB Corsair Vengeance DDR3 1333Mhz...Would it be compatible with the 2x4GB RAM that I'm using currently and would all of them work together giving me a total 24GB RAM or not? If not will I only be able to use either the new set of RAM that I may buy or the current set of RAM I'm using right now?

I have a Gigabyte GA-78LMT-USB3(rev:6.0) motherboard which has a Duel Channel memory architecture with 4xDDR3 DIMM sockets. It supports for 1600(O.C.)/1333/1066 MHz memory modules.
 
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mickrc3
I had a similar setup I build for a niece a few years back. Same motherboard, AMD FX-6300, and it had one pair of 2X4 GSkill 1600 and one pair of 2X8 GSkill 1866. The 1866 8GB DIMMS were a Newegg Shell Shocker add-on at the last moment.

No issues getting it to work but with the following results/setup requirements:
1) all sticks will run at the speed of the slowest RAM.
2) One pair (same size, same speed) of DIMMS in sockets 1/3 and the other pair in 2/4.
3) All RAM must have the same voltage requirements.
4) You may need to disable dual channel in the BIOS if stability issues pop up (I never had them).
5) You may find it hard to overclock as your RAM timings will diverge further on each clock bump.

I've mixed RAM many times...
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mickrc3

mickrc3

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Mar 20, 2016
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I had a similar setup I build for a niece a few years back. Same motherboard, AMD FX-6300, and it had one pair of 2X4 GSkill 1600 and one pair of 2X8 GSkill 1866. The 1866 8GB DIMMS were a Newegg Shell Shocker add-on at the last moment.

No issues getting it to work but with the following results/setup requirements:
1) all sticks will run at the speed of the slowest RAM.
2) One pair (same size, same speed) of DIMMS in sockets 1/3 and the other pair in 2/4.
3) All RAM must have the same voltage requirements.
4) You may need to disable dual channel in the BIOS if stability issues pop up (I never had them).
5) You may find it hard to overclock as your RAM timings will diverge further on each clock bump.

I've mixed RAM many times without problems but I always make sure that each pair is the same (since the advent of dual channel) and I do little or no overclocking. I've been building desktops since 1994 for my family, extended family, and friends (average 4-5 systems per year). Systems that stay in my house are overclocked while the rest are not (I don't like late night tech support phone calls). I'm not saying that you will never have issues with mixing RAM but if you keep pairs the same and don't push the performance envelope the chances are reduced.
 
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