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Sandy Bridge- Does VCCIO "need" to be within .5v of ram voltage? Thinking about some faster RAM

post #1 of 4
Thread Starter 
Okay, so currently Im using 8gb of gskill sniper low voltage, overclocked to 1866. The ram runs great and has given me no issues to speak of. My clocks are 1866 @ 1.35v, 10-10-10-25 timings, with 1.14 VCCIO. Ive been getting antsy lately wanting to change the rig up a bit, and thinking about going for some 2133 ram (the gskill doesnt want to OC that high). I have read that on sandy bridge, VCCIO has to be within .5v of the ram voltage, is this true? Granted, if I get RAM that is stock speed 2133, will I need to bump the VCCIO up, or did I only need to increase that because I was using sticks that were slower speeds at stock? I know the 1.65 volt vs. 1.5 volt debate with sandy bridge has been beaten to death by now, but Im curious if anyone has input on this issue? Thinking about 8gb of either these
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231476
or these
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233258
also considering these, but I dont have any knowledge of mushkin products.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226245

I am partial to gskill and would like to stick with them, since I had a bad experience with some corsair vengeance a while back. Thoughts?

EDIT: I found this thread and it appears that was only a limitation on p67 platforms. Still, I would appreciate input from personal experience.
Edited by guitarmageddon88 - 5/21/12 at 8:20am
post #2 of 4
No, VCCIO does not need to be within 0.5V of RAM voltage..

For example you can run 1.5V RAM and 1.1V VCCIO w/o any problem..

You need to see what VCCIO your CPU needs to run ceartain RAM speed, you need to find a sweet spot....

For example my 2500K does not like high VCCIO..

I'm running 2133MHz ,10-11-10-30 CR=1T, 1.65V on 2x 4GB and my CPU needs VCCIO = 1.08125V to be Prime95 CUSTOM 4096K> 4096K , 6GB test stable..

It fails with VCCIO @ 1.0875V and 1.1V, so it doesn't like high VCCIO voltage..

2133mhzp95custom4096k2h.jpg



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post #3 of 4
IME..It's a Myth..probably stems from this old 1156 thing I read
I've had some TEAM RAm that needed 1.71v to be stable
I generally set IMC voltage to 1.13 and leave it be

There's a bit of difference between those two voltages wink.gif
It ran stable..Yeah I killed it..but not from that..It's just not a good idea to try to get 5400Mhz overclocks
out of an AsRock 4+1 phase board. biggrin.gif
 
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post #4 of 4
VCCIO/VCCSA has made no difference to my CPU or RAM overclocks. confused.gif

My RAM is 2400 Cas10 2x4GB.
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