Unstable OC over 4.2Ghz. Is 1T command rate causing the problem?

krazynutz

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Hey everyone, been awhile. Just put together new system:

Asus Sabertooth X79
Core i7 3930K
Corsair Vengeance 16GB 1600

Having some issues getting past 4.2Ghz and I think it might be my memory command rate. Here's why:

Without touching my memory timing at all, CPU-Z says I have a command rate of 1T in the memory tab. Everything seems fine at stock up to 4.2Ghz. But when I OC my 3930K to 4.4Ghz or higher, I really start to have issues no matter what settings I use or guide that I follow. Nothing seems to work.

Could that 1T command rate be messing everything up even if I'm not touching any of the memory timings and it's running at 1600Mhz? Could changing it to 2T fix a lot of my problems?

Thanks
 

krazynutz

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Ha ha...yeah, that was the plan. Just seeing if anyone knew off the top of their heads any issues regarding the 1T/2T thing.

Well, it turns out, it made a difference. I haven't gotten my rig 24-hr stable yet BUT by switching to 2T, it's a lot more stable (can run Prime95 for 9 hours before an error vs 9 min) than it was before AND I can use lower Vcore voltages. Win-Win!

 

krazynutz

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UPDATE: 24-hr Prime95 stable (Blend w/ both checking on) @ 4.6Ghz!


Using Offset +.01 for both vcore and vssc so at load it's only 1.33 vcore in CPU-Z. Hottest core only reached 81C occasionally.