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Overclocking i5 2500k... My First Overclock

cooper795

cooper795

cooper795

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24 Mar 2011
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74
I tried overclocking my i5 2500k earlier with my Gigabyte P67A-UD4-B3 using this guide. However, after doing a bit more reading, I really shouldn't have changed the BCLK or moved the DRAM voltage up so high... No wonder the PC kept looping back to the BIOS screen and wouldn't load windows.

Anyways, everything is back to stock speeds now and I've had no issues. (I've been dl'ing Shogun 2 from steam for like 12 hours and according to realtemp the highest CPU temperature has been like 34 degrees). However, there's no point me having a k series chip if I don't OC it.

So basically, being a newb, I just want to know what I have to change in the BIOS to get a stable overclock. Is it possible to simply move the CPU frequency to 4.5ghz and the Vcore to approx 1.35 and just leave it at that, or will I have to change something else to get a good, stable OC?

If anyone has managed a good OC with the same CPU/board as me your help would be appreciated!

Thanks
 
I have 4.3ghz (same cpu and mobo) with only a multiplier change, so default voltages. That should be enough for pretty much anything to be honest.
 
Okay thanks mate, I'll try changing my clock speed to 4.0ghz now.

Did you have to disable (or enable, can't remember which) 'real time changes in OS' or anything like that? Or did you literally just crank up the multiplier?
 
When i go into the Bios with a i7 2600k but with the Same Mobo as you (B3 Revision) it says 1.24V in the 'Normal' collumn at the CPU VCore row when at stock. When i overclocked it to 4Ghz the 'Normal' collumn at the CPU VCore row went to 1.325v. Im not sure if 1.24V is correct and im not sure if the i7 2600k needs more volts? Try Google-ing it.
 
My vcore is down to 1.240 by default now... strange.

Anyways, I've put it up to 4.0ghz without changing anything else, I've left the voltages well alone, 'real time changes in OS' is disabled and turbo boost is on auto (I believe that's what its on by default).

I'm recording temps of 42 at the highest (when the PC was starting up) but it seems to be idling at about 30-35ish now. Hopefully it'll be stable :D.

Expecting a blue screen of death soon, but hopefully it'll stay stable :).
 
Running some now through real temp and prime 95, not sure how they work or what they do tbh, but my temps are so far hitting 50-56, with 56 the highest so far being recorded. I've had no blue screen of death so all seems to be going well.
 
I had my i5 2500k running at 4.3Ghz last week stable.

100.00 BCLK
1.25 CPU VOLTAGE
1.55 RAM

Apart from those figures I can't remember any others. My computer is currently running stock as am not realy needing any overclock the now
 
You can easily whack in a x45 multiplier, leaving voltages as auto, and see if it runs prime etc stable. Just make sure it doesn't auto over volt. It'll most likely hit 1.25~1.35ish volts, depending on how amazing your cpu turns out to be. Aslong as it hits around there and your temps aren't insane, you = win.


Edit: Make sure your checking your voltage etc under stress @4.5ghz though, it will clock down and undervolt to save energy when it's doing nothing.
 
when you start pushing these chips manual voltage is the way to go , auto tends to give more volts than needed or in some cases healthy for the chip long term.
 
my i5 2500k will only do 4.3ghz if i try 4.4 windows will BSOD and at 4.5 the bios will freeze and i have to clear CMOS.
so far i have tried all the bios's including beta ones for my P67A UD4 B3 mobo
and the same freeze up happens again and again i just wanted to run this thing at 4.5ghz stable but it doesn't look like i have a very good chip at all.
i tried various voltage settings even tried 1.4v as a one off and it still would not post. does any one have any ideas ? maybe theres a setting i'm not doing right or something !! i'm using a noctua nh d14 cooler and max temps at 100% load are 51c so its not a heat issue
 
Did an oc for a friend, this is what it was stable at.
(2600k)

BCLK : 100.00
Multi : 46
Vcore :1.325
Vdroop : Low
Dram : 1600
Dram V : 1.65

Just so you know, he's still using a stock cooler so 4.6 should be simple with an after market HSF. apparently odd numbers are more stable than even numbers with these chips so try 47x and 49x. I don't know why this would be, but a friend of mine said this. he could be full of merd though. :D
Leezaal, most RAM runs at 1.65 at stock voltage if it's performance ram, so check you DRAM V. also make sure you alter it to what ever clockspeeds it says on the ram. Auto tends to run it at a lower clock. Vdroop and CPU IO might make a difference. they didn't really for me, but i like to change vdroop to low coz i run my Vcore quite low anyway.
If you mess around with all of these and nothing makes a difference, the chances are it's your board seeing as your CPU temps are nice n low. Doesn't seem likely though, you have a nice board. My mate had the Msi GD65 (crazy bios!)
 
ok i took out 1 stick of ram and changed settings in bios and its now at 4.6ghz 1.34v in HW monitor
Temps are 35c idle and 52c 100% load and 7.22 score on cinebench 11.5.
I honestly think the bios is the root of all the problems with OC ing these chips lol.
i might blue screen yet i honestly dont know and i havent exactly run umpteen runs of prime or intel burn test etc. just relieved to get this thing running at a decent speed for now.
 
Update: At 4.7ghz. temps 35c idle and 56c 100% load.
Max voltage in HW monitor was 1.39v
using cpu enhanced halt so it drops down to 1.6ghz when idle at 1v

New problem
In windows pc runs fine at above speeds etc
when i power off and back on again bios says default cpu speed of x33
and freezes. If i run at 4.3ghz which is most i can run using both 2x 4gb ram
pc powers off and back on absolutely fine.
 
4.4 is plenty fine for anything you want to do on a PC. I'd take 4.4 or 4.5 and leave it at that before you might wreck your setup. Just a thought :)
 
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