Haswell Owners overclocks thread

String said:
Maximum recommended vcore for Haswell is 1.35 and I wouldn't have mine anywhere near there on air. If you look at advanced voltage settings in BIOS, vcore will be set at auto but you will see what the BIOS has it set at (number next to auto).

Also, your CPU shouldn't be at 4.2ghz stock frequency.
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Yeah I know it shouldnt be that at stock, the mobo just booted it at that speed on first power up (along with alarmingly high voltage). The vcore in the bios showed as slightly less than the 1.428 that HW Monitor reported (think bios claimed it was setting around 1.35 on auto)

I've set it to manual now (as the auto setting was obviously too high).

Best I have got so far is with VCore of 1.31, VRin of 1.9 and Ring of 1.2 with cpu at 4.6. Last about 5-10 mins in prime 95 before a blue screen, for first round of tests it peaks at around 75C, but when it starts the second round of tests temps shoot up, peaking at 97C.

CPU @ 4.5 with vcore of 1.295, Vrin of 1.9 and ring of 1.2 seemed stable, but again temps shot up in second phase of prime 95, peaking at high 90's.

This isn't on air though this is a OcUK 480 water cooled rad kit in use, disturbing that the temps are that high.
 
pgi947 said:
What are you using to monitor voltage? If cpuz, its known to be buggy woth z87.
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Using CPUID's HWMonitor, but also checked on CPU-Z too.

So thats interesting to note thats its buggy, but when I manually set vcore the tools seem to be reporting close to what I have set in the bios.

I don't know why my mobo defaulted to cpu speed of 4.2 and such a high voltage though, I find that very strange.
 
frontfoot said:
Yeah I know it shouldnt be that at stock, the mobo just booted it at that speed on first power up (along with alarmingly high voltage). The vcore in the bios showed as slightly less than the 1.428 that HW Monitor reported (think bios claimed it was setting around 1.35 on auto)

I've set it to manual now (as the auto setting was obviously too high).

Best I have got so far is with VCore of 1.31, VRin of 1.9 and Ring of 1.2 with cpu at 4.6. Last about 5-10 mins in prime 95 before a blue screen, for first round of tests it peaks at around 75C, but when it starts the second round of tests temps shoot up, peaking at 97C.

CPU @ 4.5 with vcore of 1.295, Vrin of 1.9 and ring of 1.2 seemed stable, but again temps shot up in second phase of prime 95, peaking at high 90's.

This isn't on air though this is a OcUK 480 water cooled rad kit in use, disturbing that the temps are that high.
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What CPU is this, i5 or i7?
 
String said:
Load bios defaults, save and exit, reboot to bios and see what the values are.
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Interesting, after hitting the "load defaults", save and exit and rebooting to bios, the default CPU speed is 3.5. The default voltage is still very high at 1.335 (for a non overclock!).

EDIT: The above are the settings, when I look to the left under the CPU status I see the CPU core is set to 4.3 and Vcore is set to 1.344
 
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frontfoot said:
Interesting, after hitting the "load defaults", save and exit and rebooting to bios, the default CPU speed is 3.5. The default voltage is still very high at 1.335 (for a non overclock!).

EDIT: The above are the settings, when I look to the left under the CPU status I see the CPU core is set to 4.3 and Vcore is set to 1.344
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It looks to me like some sort of OC software is changing things automatically, like bios turbo setting or similar. Unfortunately, I'm not experienced enough to help but hopefully someone will come along with some advice.
 
String said:
It looks to me like some sort of OC software is changing things automatically, like bios turbo setting or similar. Unfortunately, I'm not experienced enough to help but hopefully someone will come along with some advice.
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Yeah I agree, something in the bios is causing to oc automatically. Not a problem though as I can set things to manual. Just hoping I can, with some tweaking, get 4.6 stable
 
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