How to Undervolt 1.65v to 1.5v

smoats · Nov 1, 2014

My friend recently upgraded his system and gave me some of his RAM.

The ram i have is this http://www.newegg.com/Product/Product.aspx?Item=N82E16820220705

He gave me 2 sticks from this http://www.newegg.com/Product/Product.aspx?Item=N82E16820145261&cm_re=cmx8gx3m4a1600c9-_-20-145-261-_-Product

My MOBO is an Asrock Z75 Pro3 with an i5-3570k and a 550w PSU
The CAS, Latency and speed are all the same but the ram he gave me is at 1.65 volts.
How do I undervolt it to 1.5 volts and will it cause any issues?

delaro · Nov 1, 2014

Your motherboard probably already underclocked it and is running it at 1333mhz. Even so running it at 1.65V shouldn't hurt anything.

i7Baby · Nov 1, 2014

You can't undervolt some of the ram. Only all of it. Mixed ram should be avoided. Creates problems. Sell the Corsair.

smoats · Nov 1, 2014

why would the MOBO have underclocked it to 1333? (I haven't installed it yet so I can't check)

EDIT:Sorry i7Baby didn't see your answer there.
Slightly off topic but what is the fastest ram I can use with this mobo? Newegg says
Memory Standard DDR3 2800+(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066

Does that mean i have to OC the MOBO to use anything above 1600 or is it referring to something else?

Tradesman1 · Nov 1, 2014

Above 1600 a OC of the CPU may be required, most 3570Ks can run through 1866 at stock, 2133 and up, will prob need a CPU OC

i7Baby · Nov 1, 2014

No. You used to have to OC the CPU on older CPUs. But not now. Just by your ram at whatever rated speed and enable XMP in bios and away you go.

I wouldn't buy more than 2400 though - costs too much. I think 1866 is best price/performance at the moment.

Tradesman1 · Nov 1, 2014

You still do, try running 2400 or better on a non-K CPU. Most of the newer CPUs can run 1866 and many 2133, but above that, need a K model. And many of the entry level CPUs can even have problems w/ 1866. One way to get around the CPU OC is to run higher MC voltage, which also heats things up even more, and that's Intel, AMD is a whole nother animal, 1866 is generally good w/ 1866, 2133 and above will normally call for a CPU OC.

smoats · Nov 1, 2014

So the manual for my mobo says that if i want to use all four ram slots that all the ram sticks should "identical" is this just referring to the CAS, Latency, speed and Voltage? or does it mean that they need to be the same GB size too? Basically can i stick this http://www.newegg.com/Product/Product.aspx?Item=N82E16820231427 in along with my current ram and have it work as it should without any performance loss?

i7Baby · Nov 1, 2014

It means they should be a tested and certified kit.

smoats · Nov 2, 2014

What do you mean by that?

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How to Undervolt 1.65v to 1.5v

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i7Baby

delaro

Judicious

i7Baby

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smoats

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Tradesman1

Legenda in Aeternum

i7Baby

Titan

Tradesman1

Legenda in Aeternum

smoats

Honorable

i7Baby

Titan

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