Overclocking i5 2500k to 4.5Ghz help!

LooNiE

LooNiE

LooNiE

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29 Jun 2011
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41
Hi there,

I'm looking into overclocking my i5 2500k to 4.5 Ghz, but I was wondering if it realy is safe to do so. What settings would I need to change in the BIOS to get a stable 4.5?

Initially I did the automatic clocking from the AI Suite, but my computer took 2-3 tries to just boot up, I push the power button, it powers up, powers down, powers up, powers down and then finally boots up, all automatically. I was just wondering if thats something that the automatic clocking was doing?
 
I never trust those automatic overclockers. It is much better to just do it manually.

All you need to do on an i5 is to increase multiplier. On other boards it might be called a ratio.

Just find this and increase it to 40. Now you will have 4.0Ghz. Unless you are really unlucky, most i5's will go to this speed without a voltage increase. Exit and save and see if it boots up. Run a stress test (Prime95 recommended) and check your temperatures.

If you want to increase the speed again, then just go into the BIOS and increase it by however much you want. Only go in small increments though. Once you fail to boot, or you get a BSoD or the system crashes during the stress test, go into the BIOS and increase the CPU voltage (Vcore) by one notch. This should solve any stability issues.
 
Go into the BIOS, change the multiplier to 45, whack the VCore to 1.300, boot into windows, and run Prime95 for 8 hours making sure your temperatures don't exceed about 70-75 degrees. If it runs fine for that long, you can start lowering the voltage. If it doesn't, you can start raising the voltage. After a lot of fiddling you will find the lowest volts your CPU can run 4.5Ghz at, and you will then be happy. :) 4.5Ghz will be no problem whatsoever in terms of longevity.
 
If your on a decent P67 board, merely upping the multi and leaving everything on auto will suffice.

Unless you've a bad batch mobo (could happen to anyone) load V should range from 1.34-36. If your load is in the 3.8s or every breaks 4.0v.

Stop.

Read how to do it manually (with these new boards it can be a PAIN as not all support manual VCore, they use LLC and offsets)

Then do it :)
 
1.8v stock i believe, i'd stay under 1.9v. My safe limit is around 1.39v vcore but most of my clocks are in the 1.35-1.375v range. I'm only risking my own chips at 1.39v.
 
i have left everything alone, just changed multi to 44, which has kept the vcore (and temps) down to 1.2-1.25v but when prime testing (blend) or OCCT the speed under 100% load changes (multi can go anything from 39-44) whats this about? thermal throttling?
 
Thanks for the input guys, I've just overclocked it to 4 Ghz and left everything on Auto, its workin fine. If I up it to 4.5, what vScore do I need to set, 1.3?
 
Hello again,

This is what I have it up to now, is there anything else I can tweak any further to increase stability? Prime came up with no errors, but only after 5 minutes of running.

testpl.jpg
 
1.392vcore? Thats very high for 4.4ghz mate. You need to leave the prime for a lot longer than 5 minutes before you can see how stable it is also. Benchmark it overnight or something with it and see what it says in the morning. I definitely wouldn't leave it at 1.392vcore though for 24/7 stability and usage.
 
From personal experience AI Suite helps you work out the sort of settings you'll need which you can then apply in the bios. I got fed up of having to load the settings in AI when I wanted it to be different to the bios settings.

I'm still playing with 4.5 at atm and with an offset of +1.18 I see a Vcore max of 1.352, mostly staying at 1.344 in Prime. Funny thing is it's stable all day long in Prime but if I run FSX at some point it'll BSOD with a 124 code. I don't know if it wants more Vcore or if it's DRAM related (1.65v XMS3) so still a confused at the moment.

I won't run any more Vcore than ~1.35 though so I'll probably go down to 4.5 or 4.2
 
paradisiac said:
i have left everything alone, just changed multi to 44, which has kept the vcore (and temps) down to 1.2-1.25v but when prime testing (blend) or OCCT the speed under 100% load changes (multi can go anything from 39-44) whats this about? thermal throttling?
Click to expand...



I have this same problem and have the same chip and board as you, have you found a solution?
 
Cheers Paradisiac, ill give them a go and have a read up on those options, no idea what they mean.

I saw another post regarding this by 1Day, she said that it happens because turbo boost was kicking in and to disable it. Unfortunatley I cannot find an option on the z68 extreme4 to disable, the only option close to it seems to be disable speedstep, that takes the turbo boost option away completely but will leave the processor running flat out :/

But will read up on what you recommended, thanks.
 
KelDG said:
Cheers Paradisiac, ill give them a go and have a read up on those options, no idea what they mean.

I saw another post regarding this by 1Day, she said that it happens because turbo boost was kicking in and to disable it. Unfortunatley I cannot find an option on the z68 extreme4 to disable, the only option close to it seems to be disable speedstep, that takes the turbo boost option away completely but will leave the processor running flat out :/

But will read up on what you recommended, thanks.
Click to expand...

you can only disable turbo mode with stock multiplier. once you change it then the option disapears.
 
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