Upgraded from 2x4GB to 4x4GB keeping the old RAM's. PC only detects 8GB

Rest shot · Nov 19, 2016

So as the tittle said i purchased another set 2x4GB corsair ram.

However, i cannot get my pc to use them.
When i'm in my BIOS and i look at my slots, each slot detects the stick of RAM.

I have played around with my slots, and all of my RAM sticks are healthy but just wont seem to get detected when they are all inserted together.

They are installed in pairs so, one set is in A1,B1, the other set is installed into A2,B2.

My motherboard is a asus sabertooth z77.

Edit: both sets are 1600mhz and DDR 3
one set of sticks is version 2.12, the other ones are version 4.24
I have also managed to get one stick of each set working together, but i wont get past the 8GB mark for some reason..

Any help would be greatly appreciated

Tradesman1 · Nov 19, 2016

No guarantees when mixing DRAM from different packages, might try raising the DRAM voltage + 0.05 to try and stabilize, if it then sees all will want to enable XMP for 1600

Rest shot · Nov 19, 2016

Tradesman1 :

so, its entirely possible that they in fact do not match? Also i tried raising the volt, and nothing changed.

Tradesman1 · Nov 19, 2016

Sounds like they simply don't want to play, as mentioned, no guarantees when mixing even if the same exact model number. DRAM is tested together before packaging to ensure the sticks play nice, I've gotten identical sets direct from manufacturers that would play, see items 2 and 6 here:

http://www.tomshardware.com/reviews/ddr-dram-myths,4155.html

Rest shot · Nov 19, 2016

Tradesman1 :

Alright, i guess this answers my question. But do you know why i'm able to use one stick of each set with the other one, but not both of them, seems so weird..

Tradesman1 · Nov 19, 2016

Those might play, but seems all at once won't, as mentioned it's a 50/50 crapshoot if mixed sticks will play nice, could try raising DRAM voltage + 0.05 and see if that helps

Rest shot · Nov 19, 2016

Tradesman1 :

nah, i have done that, even +0.10 no help whatsoever. Thanks alot for your help

Tradesman1 · Nov 19, 2016

Sorry it wasn't more. This happens all the time

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Upgraded from 2x4GB to 4x4GB keeping the old RAM's. PC only detects 8GB

Rest shot

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Rest shot

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