Can i use dual and single rank RAM at the same time (DDR4) ?

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memz12

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Sep 4, 2012
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Hey guys, i ordered a new customised PC but i bought 8gb ram with it. It seems to be the one with 'Dual rank' I was looking around for another 4GB ram to add to it. Which would make it 12gb Ram in total. But the 4 gb ones seem to be single rank. Would it be a problem using 8gb dual rank and 4gb single rank RAM together? DDR4 btw :)

Thank you
 
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Just to stress the point, even mixing and matching 2 exact same kits may not work. You are better off selling what you have and buying 2x8gb. Also with 3 sticks installed your RAM cannot run in dual channel mode, you want 2 or 4 sticks otherwise you sacrifice performance.

I have 2 same sets of 2x4gb Corsair Vengencer DDR3 1600mhz CL9, I tried running both in 1 pc and it caused stability problems, I got the pc to boot by slackening the timings and over volting but still had occasional problems.
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jossrik

jossrik

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Sep 26, 2002
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Technically, you can, however, there is no guarantee it will run and run nicely. It is highly recommended to buy RAM in a kit rather than mix and matching. And if you mix and match, try to get the exact same modules that are in your computer all ready.
 
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sizzling

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Oct 18, 2006
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Just to stress the point, even mixing and matching 2 exact same kits may not work. You are better off selling what you have and buying 2x8gb. Also with 3 sticks installed your RAM cannot run in dual channel mode, you want 2 or 4 sticks otherwise you sacrifice performance.

I have 2 same sets of 2x4gb Corsair Vengencer DDR3 1600mhz CL9, I tried running both in 1 pc and it caused stability problems, I got the pc to boot by slackening the timings and over volting but still had occasional problems.
 
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rogert488

Jul 3, 2018
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jossrik said:


Technically, you can, however, there is no guarantee it will run and run nicely. It is highly recommended to buy RAM in a kit rather than mix and matching. And if you mix and match, try to get the exact same modules that are in your computer all ready.
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I have a Dell 5567 laptop which came with a single stick of ram,16 gb dual channel and ranked installed, a friend of mine told me it would have better performance in dual channel mode. I ordered a 8 gb kit with the same specs as the one.( I only installed one new one) I installed cpu-z app and checked , the original stick came up as dual rank,the new one as single. Everything working fine! Now I have 20 gb ram!
 
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