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Question Installing mixed size ram modules

J

jamesdsimone

Golden Member
I'm adding some memory to one of my systems. It has Samsung 4x8Gb PC1866 DDR3 now. I got 4 16Gb Samsung on ebay for 7USD each. Does it make any difference how they are installed?
 
What motherboard? It likely will matter what slots are used. Depends on the board for proper placement.
 
Shmee said:
What motherboard? It likely will matter what slots are used. Depends on the board for proper placement.
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It's an HP z420 workstation. It has 4x8Gb in quad channel now when I add the 4 16's all 8 slots will be filled. Should I put the 16's in the currently filed slots or does it make no difference? There was HP memory on ebay for 10.50 but the Samsung was less and matched what I already have.
 
I think it would be best to have them all balanced, with each channel sporting 8+16gb. That way super bandwidth intensive workloads can fill each channel at the same rate.
 
dr1337 said:
I think it would be best to have them all balanced, with each channel sporting 8+16gb. That way super bandwidth intensive workloads can fill each channel at the same rate.
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Yes. He needs to find the board manual to see how the slots are mapped to the memory channels and get the channels all the same, as much as possible.
 
Shmee said:
Wait is this a 2P board or are these 2 different systems?
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One system, it has the E5-2695 v2 in it now but I can only get 2.8Ghz out of it. Not sure why since it is supposed to boast to 3.2Ghz. The temps are in the high 60's under full load so don't think it is that. Maybe some BIOS setting? The E5-2690 v2 was only 15USD on ebay so got it just to play around with it since it's base clock is 3.0Ghz.
 
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