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Bridging the Sandy Bridge Gap: i5 2500k@4.5 on a Gigabye Z68X-UD3H-B3 - Page 2

post #11 of 14
Are you still using the stock cooler as it says in your sig rig? If so you may want to upgrade to an aftermarket solution for better cooling. I'm not sure that the stock HSF can handle a 4.5GHz OC...
 
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post #12 of 14
I have the exact same mobo and cpu as you, also get the voltage drop when running prime95, for 4.8 GHZ my V-core was set at 1.31V and LLC at level 7, got about 1.356V stable.

I'm just a noob, but it felt like the v-core set in BIOS is the voltage ceiling although it'll never really run that high under load, not sure how it chooses what voltage to run at during p95 but once you find a stable voltage, try to put your v-core settings so it hovers just above it.
post #13 of 14
Thread Starter 
I actually am still using the stock heatsink, only because I know it can handle 4.3GHz without a hitch. It's something else beyond that that's not letting reach 44, 45, 46, etc.
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post #14 of 14
Sounds like a VRM problem, but that's just my sort of un-expert opinion. I just dont know what else would cause your BIOS voltage to drop that massively, just out of nowhere.

plunx, PLEASE detail AS MUCH of your settings in BIOS/UEFI that you can. I just want to be sure there's nothing way out of line. Specifically...

1) What is your Short duration / Long duration power / Core current limits set to?
2) Are Turbo Voltage, EIST (aka Speedstep), C1E all enabled?
3) What is your LLC at?
4) Try enabling Spread spectrum and Internal PLL Overvoltage (I don't expect these to work but let's rule some things out).

Oh and last thought, try turning up LLC and seeing if that helps you. That should combat the voltage drop you're seeing, but I still think there's a hardware issue and you might want to RMA if nothing else stops this from occurring.
Edited by donkrx - 8/16/11 at 12:00am
    
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