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I've gone up as far as 1.40v (afraid to go any higher) and even lowered the multiplier down to 4.0Ghz and it still dies when i run any sort of a stress test
Are you using the stock cooler, or do you have an aftermarket cpu cooler? It's possible to OC the SB chips with the stock, but I wouldn't suggest it and may also relate to your instability issues.
I think I was able to get about 4.2~4.4 stable (when I had a 2500k) with the stock cooler, but was having some crazy high temps under load.
I've got a quick question, I got a stable oc for 4.5ghz and 1.350v. I wanted to see what it needs to run 5.0ghz. I was able to pass 5 runs of IBT with no errors and max temp on one of my highest core was 73*c at 1.385v in bios. I had my LLC at LV6 for the Gigabyte z68x-ud3h-b3
My question was, when I put the manual volts in bios at 1.385v and when I boot into windows and start latest version of CpuZ, at idle, it shows my Volts at 1.48x. But as soon as I start the IBT, it drops down to 1.38v. Is this normal?
Also, is 1.385v too high for 5ghz?
My Cooling:
EK supreme HF for CPU
EK FC4890 for the XFX 4890 gxf card
XSPC RX240 rad with 2x 38mm delta fans in push
D5 vario w/ x-top v2 as pump top
400mm EK Res
I was looking at the guide you guys created and I was stumped before as I had looked at several other guides for OC my i5 2500k. And previous guides i've used in the past have been a little vague on how to OC especially when your dealing with voltages. But with this guide you've broke it down for me step by step. I think its the best by far beginner OC guides for running these series of processors:
Here's my Rig that I've OC to 4.5Ghz:
Case: Silverstone RV03
CPU: i5 2500k
Cooler: Notua-DH14
Mobo:GA-Z68XP-UD3 Bios F9d beta
Memory: Kingston Hyper X 8gb DDR3 4x 2GB sticks
GPU: Gainward GTX 570 Golden Sample
HDD: Samsung Spinpoint F3 1TB
PSU: Corsair GS 600w
I've followed the steps with the LLC being level 5, the only thing i tweaked was the VCore which was defaulted to 1.33. As at boot up I could not get windows to be stable as i would get a constant BSOD. So i changed the vcore to 1.38 and kept the Cas settings and voltages for my memory on auto as the underclocking to 1.5v with my sticks at stock 1.6v they would bsod. So i left them on auto and xmp on disabled but changed the 1600mhz which is listed on my sticks.
After that i then went straight into prime 95 blend test last night running for the first 6hrs here's the results:
prime blend test temps 60c running vcore 1.06v @ 6hrs by NitrousX123, on Flickr
As you can see CPU is at 1.44v Max seeing as there were no BSOD and the temps are within the good temps thanks to the cooler. With that i thought i should let it continue running whilst i go to work, i left it running 7:45am this morning:
prime 95 blend test running 16 hrs 1.06v vcore CPU 1.43v by NitrousX123, on Flickr
Now after running for 16hrs this evening at 18:30 is the final result on prime, im really impressed as how stable the chip has been on this mobo. Temps were not going above 64c non stop and the cpu voltage had'nt budged at all. As i was so happy with the results to clarify that my chip is stable i went to run intel burn test:
intel burnintest results by NitrousX123, on Flickr
I set ibt to 10 tests to see if i could push it further than what was suggested, then left the memory allocation on default which was using approx 6gb of my 8gb of ram. Max temp here was 72c, but it did'nt reach any higher than that the cpu is 1.44 the max.
Seeing as my clocks are stable at this voltage. How should i go about lowering the voltage? Should I raise the LLC to level 6 or lower the vcore to say about 1.36v and see where i go with all the cores running at full load in prime 95?