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I5 2500k @ 4.3 ghz by only changing multiplier

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October 5, 2011 10:19:56 PM

Hey everyone,

This is my first overclock. I reviewed the sticky on how to overclock an i5 2500k.

Motherboard is Gigabyte GA-Z68A-D3H-B3, and I have the coolermaster 212+ hyper, and 4 case fans.

I tried enabling and disabling all of the features listed in the sticky. Unfortunately Gigabyte doesn't have all of the same names as whatever motherboard he was using, so I was only able to modify about half.

After modifying the settings, I was able to increase the clock to 4.3 ghz. 4.4 would not boot. After scanning several other sites for information and tweaking more, I was no longer able to boot at 4.3 ghz.

I figured I did something wrong so I restored the optimal settings option in the BIOS and just changed the clock to 4.3 ghz.

So I have factory BIOS settings and just changed the clock. It's running fine for right now. But I would like the get it to 4.5 ghz.

Any suggestions?

Thanks!
a c 88 à CPUs
a b K Overclocking
October 5, 2011 11:35:25 PM

Its your motherboard, it has a poor voltage regulation unit and the VRM's aren't cooled. Putting heatsinks on the VRM's may help, but you may have reached the motherboards OC limits. 4.3 ghz i5 2500k is plenty fast enough anyway, your not going to notice the difference with another 200mhz.
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October 5, 2011 11:41:32 PM

I've read about several people with the same motherboard getting 4.5 ghz and above. Could it be something else?
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October 6, 2011 12:34:36 AM

OK, we'll start with overclocking 101:

It's stable at 4.3Ghz with vcore still on auto.

What is your LOAD vcore (cpu-z open when running prime95)?
What is your LOAD temps(coretemp or realtemp open when running prime95 for at least 10 minutes) ?
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October 6, 2011 1:04:04 AM

I giggled like a little girl when I was able to O/C my Celeron Slot 1 from 300 to 450 MHz.
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October 6, 2011 1:05:40 AM

RJR said:
OK, we'll start with overclocking 101:

It's stable at 4.3Ghz with vcore still on auto.

What is your LOAD vcore (cpu-z open when running prime95)?
What is your LOAD temps(coretemp or realtemp open when running prime95 for at least 10 minutes) ?


I just downloaded cpu-z and it says the "core voltage" is 1.056 V.

After running prime95 for about 20 minutes, my temp is 55 Celsius on the "package" of CPU temperatures, even though each core stays about 48 degrees in CPUID Hardware Monitor. Hardware Monitor also agrees with cpu-z that the vcore is 1.06 V.

I wasn't sure if that was the correct voltage since I thought voltages were usually around 1.3 V, so I checked a utility that came with my motherboard called EasyTune and it said my voltage is 1.284 V.

All of this information was gathered while running prime95.
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October 6, 2011 1:09:57 AM

At stock speed, yes that's fine, what about at 4.3Ghz?
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a c 88 à CPUs
a b K Overclocking
October 6, 2011 2:22:30 AM

http://www.tomshardware.com/reviews/overclock-cpu-sli-s... Toms used a similar motherboard and couldnt do much with a CPU overclock. Your motherboard is even lower end than the one in that article and only has 1x 4 pin cpu power connector, suggesting not enough stable power is getting to the cpu.
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October 6, 2011 3:30:11 AM

iam2thecrowe said:
http://www.tomshardware.com/reviews/overclock-cpu-sli-s... Toms used a similar motherboard and couldnt do much with a CPU overclock. Your motherboard is even lower end than the one in that article and only has 1x 4 pin cpu power connector, suggesting not enough stable power is getting to the cpu.

Well I just happen to know a bunch of Reviewers on overclocking web-sites, oh yeah I almost forgot I was one too, and some can't overclock to save their life.

True this wouldn't be my first choice for an overclocking board but most have been able to get around 4.6-4.7 Ghz out of it. The OP is looking for 4.5 Ghz, so it should be an obtainable goal with a little work.
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October 6, 2011 4:41:10 AM

Well if its worth persuing, you cant rule out that his particular CPU is no good, but its worth a try to do a BIOS update. But for decent overclocking, everything should be set manually, forget auto overclocking. I would be putting heatsinks on those VRM's though, would be to scared to blow them up.
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October 6, 2011 4:58:53 AM

RJR said:
At stock speed, yes that's fine, what about at 4.3Ghz?


That was at 4.3 ghz.

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October 6, 2011 5:08:17 AM

iam2thecrowe said:
Well if its worth persuing, you cant rule out that his particular CPU is no good, but its worth a try to do a BIOS update. But for decent overclocking, everything should be set manually, forget auto overclocking. I would be putting heatsinks on those VRM's though, would be to scared to blow them up.



All of my motherboard drivers have been updated. I tried manually changing what I read should be enabled and disabled, but still had no luck. Whenever I pushed passed 4.3 ghz, my pc would reboot wight after the BIOS screen.

Now I changed to "optimal" stock settings now through resetting the BIOS, only modifying the multiplier to get to 4.3 ghz.

Temps usually dont exceed 50 degrees Celsius, is there still concern of my VRMs "blowing up"?
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October 6, 2011 5:11:24 AM

RJR said:
Well I just happen to know a bunch of Reviewers on overclocking web-sites, oh yeah I almost forgot I was one too, and some can't overclock to save their life.

True this wouldn't be my first choice for an overclocking board but most have been able to get around 4.6-4.7 Ghz out of it. The OP is looking for 4.5 Ghz, so it should be an obtainable goal with a little work.


Thanks for your optimism. I really hope I can reach that clock, even if it isn't a huge increase from 4.3 ghz performance wise. To me it just seems like the speed I should have given the cooling parts I purchased with my rig. However now I'm second guessing my choice in motherboard. But I did read of several people who got it to 4.5 ghz with this board.
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