Thats amazing

Btw those 3k kits... What are the chipset.

Cause hmm corsair qualify them as vengence pro so guessing its not a binning issue.  So cant be that rare.

Btw have u thought of doing like the gamer profile.
5ghz one core etc

Just stressed the cpu only using msi's extreme tuning utility and it managed to go pass 30mins at 4.5ghz-1.2v. But when I stressed the cpu only using prime95 it crashes after exactly 15min. I used the max fft setting for prime95. Both stress test ram are default.

Arrrgghhh!!! All my OC for nothing!

Booted up my normal windows at 4.2Ghz @ 1.1v. Run prime95 (27.9) and noted vcore jumped to 1.198v and temperature jumped to 81-82'c!!!!

Compared to my previous OC (in a fresh windows 7), the weird thing was that the same prime95 ran small FFTs with type-0 FFT. Now in my main windows 7, it is using AVX FFT!!! 

Summary
Prime95 (27.9) in fresh win 7 (type-0 FFT) - OC 4.2Ghz @ 1.1v, vcore 1.129v in CPUz, realtemp 72'c max (2 hours stable)
Prime95 (27.9) in main win 7 (AVX FFT  ) - OC 4.2Ghz @ 1.1v, vcore 1.198v in CPUz, realtemp 81-82'c (in a few seconds)!!!! 

Wasted my whole day..... 

that means MSI Extreme Tuning Utility is not as stressful as Prime95. So, better don't use it for stability test.

Really? I'll try to oc it 4.4 or lower and see whether is it stable. Could it be ram issue?

Let me guess.

Your main win7 is Service Pack 1 (SP1)
fresh win7 is vanilla (none-SP1)

SP1 has AVX instruction which vanilla doesn't.

Caveat – big, massive, honking, pay attention to this – caveat! When using adaptive voltage, the top of the curve isn’t necessarily the whole story. ASUS drove this point home when we met and I’m doing so now; we all need to do this as a public service to our users and readers. Even though you set 1.25 V as your maximum voltage, under certain very heavy loading conditions (i.e. stress testing), the voltage can and will exceed the maximum you have set. Let me say that again – if you stress test using adaptive voltage, even with the maximum set to 1.25 V, the CPU will – guaranteed – request and receive more voltage than you have told the motherboard to deliver it. It’s just the way this works.

In the ASUS demonstrations, setting a maximum 1.25 V in this scenario and then running something like AIDA64, Prime95, etc – any stress testing application designed to stress more than normal loads – the CPU requests and gets ~1.36 V. There is nothing you can do about this and it will happen whether you want it to or not. The only way to prevent stress testing programs from pulling extra voltage is to use a manually set voltage, which takes away your CPU’s ability to reduce voltage when idle.

All is not lost though! You probably noticed every time I told you what would happen it went hand in hand with stress testing. That’s because those are the only scenarios that will lead to this behavior. In all other circumstances so far as ASUS can tell, the CPU will cap at the set 1.25 V and never exceed it. Even if you’re Folding@Home it should maintain the 1.25 V cap (though those folding at home are under 100% load all the time and I’d suggest using a manual voltage for those machines just in case). Likewise, video encoding, audio encoding, compression, rendering – any CPU-intensive process, your CPU will maintain the 1.25 V cap.

So, now that you know the very important caveat, set 1.25 V as your maximum voltage with adaptive voltage, enable C1E and EIST (which throttle your multiplier and voltage when not under load) and go on with your merry life knowing your CPU is as relaxed as it can get when idle.

Theres 4 ways to clock
Fully manual
Adaptive
Offset
SVID

adaptive issue is the vcore can be more than what u set.
So far seems manual on vcore n ring bus with offset on vcssa/cpu io d/a is the best. Fully c-state.

Will post up some pics when I get back from overseas, but now I have tested 4 retail CPU's under cold (1 on Asus M6E and the others on MSI MPower)

Have to say the results are really disappointing so far - Haswell will be an okay upgrade from older platforms, but I think I would stick to Ivybridge for now.

Moderate overclocks on air / water should be okay, and the ram clocking definitely much more fun - just a shame about the top speeds.....

1 CPU max 5500 4c/8t, 2 max 5700, best one 5800

Top speed for quick 2d benching only 6g so far - 2 cores at -110 temps

Didn't know that 

However, I guess all is not lost. Played some games e.g. BF3, bioshock infinite and my OC is stable and vcore is at the usual 1.129v and not 1.2v.

Read about adaptive voltage from the 1st page link (the 3 step guide to overclocking i7/i5). I guess that's the reason why my proc shot up to 1.2v but more or less safe as most CPU-intensive process don't jack up the vcore more than what is set in bios.
One day when I have time to OC again, I will ask you how to set the "offset on vcssa/cpu io digital/analogue"....... 

For now, back to stock clock! 

Nice Kevin.....

Just your mem Read/Write/Copy is to low in Aida64.?.....I noted this from your fist post.
Should be arround 35-40K
Edit:
New Z87 BIOS on Gigabyte web page.
(except UD5H)

AsRock new BIOS:
http://www.xtremesystems.org/forums/showth...l=1#post5194402