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Different RAM can work together

djstathis
By djstathis
in CPUs, Motherboards, and Memory
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Hello guys ! I am having some trouble and I urgently need your help. I am a bit on the noob side of tech stuff and I would like some guidance pls!. I currently have in my system the following memory CMD16GX4M4A2666C15 4x4 GB and I want to add another set of 4x4 GB so that I can have a total of 32GB of RAM. The new modules that I want to buy are the CMD16GX4M4A2666C16 but there is a difference in the tested speed latency. For my current ones the tested speed latency is 15-17-17-35 and for the new ones is 16-18-18-35. Having in mind that the default speed latency of both the current and the new is the same 15-15-15-36, can I mix them together on my system? Any help is appreciated ! Thank you !

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Yes, you will be limited to the cas latency (c16) of the slightly slower new set if you are using all sticks at once ;)

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it's always best to buy as close to what you have as you can, but i've done some of the most terrible mix&matches and i've never really had issues.

 

one piece of advice tho: always put the slowest stick in the first slot. some mobo's are appareantly very lazy with seeing what speed the sticks are supposed to run at.

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Don't mix different modules in the same channel and all of your ram will operate at the slowest speed set.  Might have to put the slower set in the first channel.  Ultimately it's best for all the ram to be the same exact ram to best ensure no issues.  It's been a while since I tried to upgrade to more than a single channel and when I did try it wouldn't work for some reason - but it was DDR1 days and I had a dirt cheap brand mobo.  Most if not all manufacturers have a compatibility chart on their product pages that say what has been tested and confirmed to work and in what configurations.

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