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i7 2600k limited by new B3 mobo (worse OCing)

post #1 of 14
Thread Starter 
I had an i7 2600k with an Asrock P67 Extreme 4 motherboard, overclocked to 4.0GHz at 1.165v-1.170v prime95 stable.

However, I recently I got my Asrock B3 Extreme 4 replacement motherboard...
now 4.0GHz isn't stable even with 1.2v! I had to set it to something like 1.22v to get it stable.

Is it possible that a new motherboard of the same model can make a huge difference in overclocking?

I'm sad that I had to give up a great overclock with undervolt in order to get SATA ports that won't fail in a few years... =(

My temps have gone from 53'C full load to 60s'C full load.
post #2 of 14
yes it could differ
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Ryu's Den :3
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post #3 of 14
Is that vcore you're listing the vcore set in BIOS or set at load? Are you using loadline calibration? I know my 2600k is fine at 1.164v load at 4 ghz, but I have it set to 1.25v in the BIOS, and that hasn't changed with boards. If I were using LLC, I could probably set it to 1.18v (Possibly lower, as I don't know the low vcore limit).

That seems very odd for 4 ghz. Might be something other than the vcore but I don't know much about the settings.

What vcore do you need for 4.5 ghz?
Edited by Falkentyne - 4/18/11 at 3:41pm
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post #4 of 14
this is quite disappointing... you have my sympathy man. As an ocer nothing feels worse than getting a healthy mobo that OCs worse than a faulty mobo. -_-
post #5 of 14
Thread Starter 
RawrRawrRaw!!! More voltage to the mobo somehow to reduce my cpu volts?
post #6 of 14
What do you mean?

BTW, did you check the +12v on your board? If its too low, that could adversely affect the vcore needed.

BTW you didn't answer my last question. Were those voltages you listed in your first post, your BIOS settings or your settings at load in stress tests?

I already know for a fact that SOME boards are actually using different hardware on B3....like the UD5 for example, had a defective VRM on B2 that caused LLC1 to overshoot by 0.05v+ and LLC2 to be unusuable (0.15+v = instant reboot). And this wasn't a BIOS bug, because crossflashing a B3 BIOS didn't fix this for a B2 board. But this issue was fixed on the actual B3 version of the UD5 (LLC1=small vdroop, LLC2=small vrise, though more droop/rise at higher voltages of course), which clearly showed that it wasn't a BIOS bug (otherwise, crossflashing B3 bios onto a B2 board would have fixed it, just like it fixed the cold boot issues).

There was no board revision number change to indicate that.
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by Falkentyne View Post
What do you mean?

BTW, did you check the +12v on your board? If its too low, that could adversely affect the vcore needed.

BTW you didn't answer my last question. Were those voltages you listed in your first post, your BIOS settings or your settings at load in stress tests?

I already know for a fact that SOME boards are actually using different hardware on B3....like the UD5 for example, had a defective VRM on B2 that caused LLC1 to overshoot by 0.05v+ and LLC2 to be unusuable (0.15+v = instant reboot). And this wasn't a BIOS bug, because crossflashing a B3 BIOS didn't fix this for a B2 board. But this issue was fixed on the actual B3 version of the UD5 (LLC1=small vdroop, LLC2=small vrise, though more droop/rise at higher voltages of course), which clearly showed that it wasn't a BIOS bug (otherwise, crossflashing B3 bios onto a B2 board would have fixed it, just like it fixed the cold boot issues).

There was no board revision number change to indicate that.
Well I used the exact same settings on my B3 as my B2. The only difference is the vcore.

Btw, do you know if B3 mobos have temperature sensor irregularities?
post #8 of 14
What are you using to monitor the temps?
The DTS (digital sensor) inside the CPU is cpu controlled and is not affected by the BIOS. The motherboard's CPU temperature reading, however, is read from a sensor next to the CPU die, and *is* controlled by the motherboard, and can be calibrated differently depending on the BIOS. If you want your temps, use realtemp 3.67 or hwinfo32.

I had an old BIOS once (not for this board) that gave me 15C idle when my ambient was around 27C ...(Yes, on air...you can't cool below ambient...), previous BIOS version that wasn't borked gave me around 32C idle.
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post #9 of 14
Thread Starter 
I'm using HW-monitor for temps. Both idle and load temps seem to be a good deal hotter than what I had with my old mobo. (since I've heard it's mostly idle temps are corrupted whereas load temps are usually far more accurate)
post #10 of 14
Use realtemp 3.67. Only the core temps matter. But if you didn't use realtemp wtih the other board, you have no point of reference...

But DTS sensors do not change based on board, without vcore and current changing. I saw no direct change with DTS sensors going from B2 to B3 boards here.
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