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Kingston HyperX max safe voltages?

post #1 of 6
Thread Starter 
I know this question has been asked millions of time, and I've done my googling but answers seem to be contradicting:
1. Never EVER go past 1.65v vDIMM and 1.35v QPI/DRAM on i7s
2. You can go past 1.65v vDIMM for 24/7 as long as QPI/DRAMM is within 0.4v of it.

At 1600MHz, 1.35v QPI/DRAM, and 1.65625v vDIMM my computer doesn't blue screen but Prime95 blend errors out within seconds with a "hardware failure" warning (not a rounding error).

Please keep in mind I need this overclock to be safe for 24/7 folding.

Thanks!
post #2 of 6
I am confused..
The amount of Voltage you can put to your RAM, has nothing to do with your stability issues.
If you are trying to push your RAM pasted rated speeds, then adding some voltage can help, some MC's scales well with voltage, others don't.
Yes you can run over 1.65V, no don't go over 1.9V
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Drunken Monkey
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by justin.kerr View Post
I am confused..
The amount of Voltage you can put to your RAM, has nothing to do with your stability issues.
If you are trying to push your RAM pasted rated speeds, then adding some voltage can help, some MC's scales well with voltage, others don't.
Yes you can run over 1.65V, no don't go over 1.9V
Well, my CPU overclock is stable (I put the RAM down to the lowest frequency and auto voltages, and tested my CPU with IBT and Prime 95 small ffts), but when I put my RAM into the picture it became unstable, so by logical deduction I would say my RAM is unstable, and my RAM is unstable because it's not being fed enough electricity, no? So my question really was what was the max safe voltage, and you have answered that, so thank you and +rep

I did try loosening timings from 9-9-9-24 to 9-10-9-24 and it's passing IBT runs so far at the same QPI/DRAM voltage but lower vDIMM, so if that small sacrifice will get me a stable system at much lower voltages, I think I might as well go with that.
Edited by crazyap7 - 1/9/11 at 12:03pm
post #4 of 6
Not logical, most RAM errors will not be fixed by upping the voltage to the RAM, but rather through the Timings, and the IMC
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post #5 of 6
So you are running the rated 2000Mhz memory at 1600Mhz 9-9-9 24? They shouldn't even need a full 1.65V to do that, what frequency is the uncore running at, for 980x it only needs to be minimum 1.5x the mem multi, & shouldn't need 1.35V for 1600Mhz ram.
    
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post #6 of 6
Thread Starter 
Well, Kingston rates it at 2000MHz, but that's through insane QPI and vDIMM voltages. Uncore I run 2x the memory frequency.
Thanks for your comments so far!
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