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I lost my overclock...

prime2515102

prime2515102

[H]ard|Gawd
Joined
Mar 3, 2003
Messages
1,603
Specs:
i5 2500k (Corsair H100)
Gigabyte Z68X-UD3H-B3 rev. 1.3

So I was running my i5 2500k at 4.5Ghz for the past 2 years or so with no problems. Turbo was disabled and all voltages were set to auto except CPU Vcore was set to "Normal" and "Dynamic Vcore (DVID)" was set to +0.16 (I did this to keep power management active). The CPU pulled 1.38xxV full-load according to various monitoring applications.

I decided to try the U1L beta bios just to see if it was any good and I lost the ability to run over 4.2Ghz no matter what I did.

So I flashed back to the F11 BIOS.

Now I still can't OC with the exact same settings I was using when running at 4.5Ghz. I tried flashing the BIOS a second time but there was no change.

This same thing happened with the F12 BIOS, but after flashing back to F11 everything was fine again.

Any suggestions? I don't understand what could have happened to remove the overclockability.

Are there some command line switches that maybe I need to use when flashing? I don't know...
 
i had that happen once. it was with a Phenom II X4 955BE. I'm not sure what it was, but I had to go from 4ghz to 3.6ghz slowly (3.2 default). i'm guessing it had to do with power.
 
Are you sure that all the memory settings are the same?

That seems somewhat high voltage for 4.5 GHz.
 
Yeah, the memory timings are the same, and yeah, my CPU (or mobo) is somewhat of a dud on the voltage front.

There's something else going on here. I can't get into the CMOS setup now. Once it loads, it restarts. I can get into Windows though.

I'm going to pull the battery before I leave today and see if that helps. I should have done this in the first place. It's been running so well for so long that I forgot how to troubleshoot. lol
 
In case its a co-incidence, remove any unnecessary USB devices.
I had a USB pen that would cause my overclock to reset every time I rebooted with it plugged in (on Gigabyte P67a mobo).
If I plugged it in after boot, it would work fine with the overclock.
 
I figured out the problem. I had CMD rate set at 1, and this has always worked, but apparently it needs to be set at 2 now.

Another oddity is that my bus is running 100.28 now (set at 100) whereas before it was running 99.xx.

This board is odd as hell. I might have to give Asus a try next time.
 
Ok, setting the CMD rate to 2t has opened up some OC headroom (I'm at 4.7Ghz now) but I'm not sure what my voltage is now.

CPU-Z (1.7) says 1.428V @ Prime95 load, and Core Temp says 1.3811

Is there anything else out there that is considered universally reliable for voltage readings?
 
Alright, well, 4.7Ghz it is. I tried to push 4.8 but LinX was unstable (3DMark and Prime95 ran without issue).

So, 4.7Ghz, 1.428/1.3911V (Core Temp changed after a reboot), 83C peak (LinX), 126.2864GFlops peak.

Good enough. I'm never messing with it again. lol

Have a nice day! :)
 
what cooler are you using? i run an i5 2500k too and i've never even thought of going that high
 
A Corsair H100 with two 120mm fans. The Tjmax on this CPU is 98C so as long as it's stable and I'm under 1.45V I'm not worried.
 
hardware monitor is helpful if you're trying to track high and low random voltage spikes or drops.
 
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