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Mixing Ram Voltage - Motherboard Stability

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August 5, 2014 2:12:32 PM

I have the H87M-PLUS/CSM Motherboard which I bought off a friend with 2x4GB of Corsair 1600MHz 1.65v RAM. I want to add another 16GB on top of this but have been reading elsewhere that 1.65v RAM is not the most stable voltage. I know the MHz of the additional RAM should match the 2x4GB but what about RAM voltage? Can I mix 1.5V with 1.65V? Should I just ditch the 2x4GB altogether?

I tried looking but couldn't find whether or not 1.65v is recommended on the H87. Anyone know where to look those ratings up?

a c 86 V Motherboard
a b } Memory
August 5, 2014 2:18:49 PM

Try it at 1.5V and if that does not work, bump it up by +0.05 and try again.

If you do not want to ratchet it up to 1.65V trying to make it work, your other option you could try would be to drop down to 1333.
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a c 81 V Motherboard
a b } Memory
August 5, 2014 2:19:52 PM

OK if you plan on trying to mix match ram, which is not always possible because of compatibility issues, it is best to get the same speed, timings and voltage. The voltage is kind of a must if you want to run it like this for an extended period. putting 1.65V to a 1.5V set of ram could damage the ram over time.
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a c 132 V Motherboard
a b } Memory
August 5, 2014 2:22:21 PM

Ideally you want to match voltage clocks and CAS when mixing ram, and even then you can run into problems. Also on many boards using unbuffered ram maxing out the memory slots can put extra load on the MC and cause instability. Sometimes you can add voltage and relax timings and lower frequencies to compensate.
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a c 98 V Motherboard
a b } Memory
August 5, 2014 2:22:44 PM

what do you need 24 gig of RAM for?

Ditch the 1.65 volt and just use 1.5 volt
If you try and run 4 DIMMs at 1.65 volt Im picking you will have cpu problems

You could run all 4 DIMMS at i.5 volts if you select an XMP profile from the 1.65 volt RAM that lowers the frequency , but again you'd have to have a really good reason to want 24 gig of RAM
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a c 1725 V Motherboard
a c 2179 } Memory
August 5, 2014 5:58:55 PM

Your best bet is just to get a single set of the amount you want - that way the sticks are guaranteed to play together, then you could try and add the old in (and have a bonus) or just use in another rig or sell them.
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