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Mixing RAM doesn't work (Corsair MZ8GX3M2A1600C9R and CML8GX3M2A1600C9W)

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April 11, 2014 4:42:12 AM

Hi experts of pc building,

My rig has been running with a pair of CML8GX3M2A1600C9W and I want to expand the RAM volume to 16gb
I bought CMZ8GX3M2A1600C9R since I think their spec. are same (at least to my observation)
I thought the voltage difference is not a problem but now I think I am wrong because the rig doesn't boot up now. (old pair is 1.35v and new pair is 1.5v)

My MB is Asrock Z68 pro3
I tried to set the DRAM voltage in Bios to 1.545V (The lowest optional value >1.5v) but it doesn't work.

Strangely if I keep this option (DRAM voltage 1.545v) without the new RAM installed, the old RAMs work fine, however in CPU-Z SPD page, it shows the XMP-1600 voltage is still 1.35v.

Unluckily in the UEFI bios I don't find any option to set different voltage for each memory slot. (Is it possible?)

Any idea how I can get these 2 pairs of RAM work together?
Thanks for any advice. (Sorry if my English looks weird, I'm not a native speaker.)

CML8GX3M2A1600C9W
CMZ8GX3M2A1600C9R
Asrock Z68 pro3
a b } Memory
April 11, 2014 5:19:35 AM

Never mix ram brands! even if it had the same voltage and frequency. it will cause problems and may not even boot. get a ram kit.
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April 11, 2014 7:08:57 AM

ModernWarfare said:
Never mix ram brands! even if it had the same voltage and frequency. it will cause problems and may not even boot. get a ram kit.


I haven't mixed brands. Both pairs are from Corsair
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a b } Memory
April 11, 2014 7:36:10 AM

You mixed models with slightly different specs. Memory in kits are tested to make sure they will work together. So, even if you add memory to a kit you are taking a chance. Lot's of times memory of the exact same model & specs will not work together when mixing sticks. Safer to buy a kit of the total memory that you want or need.
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a c 2184 } Memory
April 11, 2014 8:47:28 AM

Not a good idea to mix DRAM as explained above, what you could try here though is look in the advanced section of the BIOS for VCCIO, VTT or CPUVTT voltage and raise whichever is there of those 3 about + 0.15 and try, those are the common designations for the MC (memory controller) voltage
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