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i7-3930k and ram troubles

post #1 of 8
Thread Starter 
Ram: Corsair Dominator Platinum 2400mhz 9-11-11-31 @ 1.65v (16gb)

Hi Everyone,

I don't know if this should be in the cpu or the memory section since I'm having issues with the ram after I overclocked my cpu. Though I think posting here made more sense.

Anyway,

Before this problem I had trouble with running the ram at its rated specs at cpu stock settings. After long hours of testing and googling it was cpu's fault. It could run the sticks at 2133mhz just fine but if it passes that, even by a few mhz, it becomes unstable. So I ran the ram sticks at 8-9-9-24 @ 2133mhz 1.65v and it was perfectly stable in prime95. (ran prime for about 2-4 hours before stopping the test). I was happy with it because it gave me almost the same response time, just a hair slower, at its rated specs.

Now the current issue is after overclocking my cpu to 4.4ghz @ 1.256v, I can't even run the ram sticks at its previous settings nor its rated specs and be stable. Errors in prime start popping up less than 10 minutes. So right now I got them at 2133mhz 9-11-11-31 1.5v and its perfectly stable. Though I don't know why I have to lax the ram sticks again just to run at 4.4ghz
Edited by Discgear - 10/28/12 at 3:11pm
post #2 of 8
Up the Northridge volts (link between CPU and RAM) in bios, the name should start with something like vcc...
 
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post #3 of 8
Thread Starter 
If you talking about vccsa voltage it's at 1.2v.

[URL=http://]http://rog.asus.com/forum/showthread.php?19926-3930K-C2-Degradation[/URL]

This thread talks about cpu degradation with vccsa and vtt voltages above 1.2
post #4 of 8
Why are you running so much vccsa?
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post #5 of 8
Now that you have upped the CPU clock, the stress on memory is higher as the overall bandwidth went up.
1067MHz 8-9-9 is a very impressive overclock on both CAS and tRCD/tRP for Samsung ICs which your Dominator Platinums are based on, so it's hard to say which timing exactly causes them to fail.
If they are stable again after raising Vmem to 1.67-1.68V then it's CAS, otherwise try bumping tRCD and tRP from 9 to 10.
post #6 of 8
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Why are you running so much vccsa?

That is the default voltage for the Asrock x79 Extreme 11 motherboard and also in this thread

http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers

states raise raise it to have stability with the ram if there are issues which I am having.
Quote:
Originally Posted by Sam OCX View Post

Now that you have upped the CPU clock, the stress on memory is higher as the overall bandwidth went up.
1067MHz 8-9-9 is a very impressive overclock on both CAS and tRCD/tRP for Samsung ICs which your Dominator Platinums are based on, so it's hard to say which timing exactly causes them to fail.
If they are stable again after raising Vmem to 1.67-1.68V then it's CAS, otherwise try bumping tRCD and tRP from 9 to 10.

I tried what you have suggested and I still get errors. Bumped each one up one by one with increased voltage to memory and still nothing. 8-11-11 gives me nothing but 9-11-11 makes it stable and since I can't go at 2400mhz I bumped the voltage back down to 1.5v, vccsa and vtt to 1.095 from 1.2v and remains perfectly stable.
post #7 of 8
Thread Starter 
erp... sorry its the XMP profile that sets those voltages. Going off of XMP brings me to 1.1v and going to stock settings brings it even lower to 0.875v

So right now my overclock settings:

CPU: 4.4Ghz @ 1.256v (same)
RAM: 2133mhz 9-11-11-31 @ 1.5v (same)
VTT: 1.048v (from 1.2v)
VCCSA: 0.870 (from 1.2v)

And remains stable. When going off XMP and telling the ram to be set at 2133mhz and left the timings on auto the motherboard set them to 11-11-11-31. When running prime95 my temps dropped almost 10c from around 78c down to 69c. Going back into bios changed it back to XMP just to have the right timings (speed and voltages stayed the same) and my temp went back to around 78c under prime. Though it occasionally drops few degrees and goes back up after a while or a few minutes. I know its not throttling due to its temps since it hasn't reached the Tj max. The fan and pump rmp remain constant. Under looser timings like 11-11-11-31 the cpu temp barely hits 70c and stays around +/- 1c through the whole test.
post #8 of 8
Thread Starter 
After more testing it seems to be alright with 1600mhz at CAS 6 which is pretty tight I think. But requires looser timings for 1866mhz and 2133mhz at CAS 8 and CAS 9 respectively. That is as low as they go and since they are loose the voltage can be dropped from 1.65v to 1.5v for the ram. VTT and VCCSA can be drop aswell.

Now my question is do I have a weak memory controller or it's just being picky?
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