Overclocking a 2500K

the_darjeeling · 10 Apr 2013 at 08:25

Hi guys

I'm tempted to OC my i5 to 4.0Ghz and after looking at various guides and threads on here it seems that all i need to do is go into the BIOS and change the multiplier to 40 is it really that simple? also from reading around it seems that my Mobo disables intel speed step when its overclocked and the way to get around it seem quite complex, so i was wondering if there's an easier way round it?

Thanks

ince · 10 Apr 2013 at 08:38

I am also interested in this. I have done what you say in the mb bios

My mb is Gigabyte GA-Z68AP-D3

Deleted member 2277 · 10 Apr 2013 at 13:24

Instead of changing the multiplier you can change the turbo boost setting for each core, I.e. leave the multiplier at 33 and change each core to 40 by doing this the speedstep will still work.

kiel367 · 10 Apr 2013 at 13:34

disable all speedstep options, and yes change it to 40x multi, dont use turbo boost, and you will be good, iv got pretty much the same combo @ 4.3 with a small voltage bump only im on a z68ap-d3 the same as ince

(edit) the mobo does not disable speedstep for you, but might as well turn it off unless you are wanting to save on powerrrrr

the_darjeeling · 11 Apr 2013 at 10:27

Deleted member 2277 i just had a look in the Bios and i cant see any way to change the settings for each core just one for adjust CPU ratio and looking in the mobos manual i cant see anything about being able to modify each core individually :mad:

and kiel id rather have speed step on since if i go higher i don't want it running high when theres no use for all that power

is my best option to just bump up the CPU ratio to 40 and then see how stable it is? will i need to bump up the Vcore? or will it be alright at the level it is now?

kiel367 · 11 Apr 2013 at 10:38

for 4ghz you shouldnt need to have any voltage bump, i hit 4.3 without any other tweaking, just the multi

StonedPenguin · 11 Apr 2013 at 10:41

Why turn Speedstep off? Auto downclocking to ~1.6ghz when idle is handy.. No need for it to be at 4+ghz 24/7 if left idle.

kiel367 · 11 Apr 2013 at 10:43

mines on a 4.5ghz 24/7 overclock, and i wanted it like that permanently so disabled it, my pc is never idle when its turned on

Doomedspeed · 11 Apr 2013 at 11:51

the_darjeeling said:
Deleted member 2277 i just had a look in the Bios and i cant see any way to change the settings for each core just one for adjust CPU ratio and looking in the mobos manual i cant see anything about being able to modify each core individually and kiel id rather have speed step on since if i go higher i don't want it running high when theres no use for all that power

is my best option to just bump up the CPU ratio to 40 and then see how stable it is? will i need to bump up the Vcore? or will it be alright at the level it is now?

best option is keep the vcore on normal.and up the multiplier to 42. Then prime test it.

the_darjeeling · 11 Apr 2013 at 17:08

Doomedspeed said:
best option is keep the vcore on normal.and up the multiplier to 42. Then prime test it.

how long should i prime test it for? is it worth doing IBT as well?

thanks

Dom86 · 11 Apr 2013 at 17:22

the_darjeeling said:
how long should i prime test it for? is it worth doing IBT as well?

thanks

I've just been overclocking my 2500K and letting prime go for 4-5 hours

Deleted member 2277 · 11 Apr 2013 at 22:20

the_darjeeling said:
how long should i prime test it for? is it worth doing IBT as well?

thanks

When I was trying to achieve my highest overclock I could run prime for 24 hours without errors but IBT would fail after a short time so I would say run both. To check my 4.5GHz overclock I ran prime for 24 hours and IBT for 12 hours. I also ran prime and furmark for 12 hours. I am now confident that my 2500K is stable at 4.5GHz @ 1.288v

Doomedspeed · 11 Apr 2013 at 22:36

Pointless running it for that long, prime isn't the best test for stability, your general everyday use is (games).

I normally run prime for 30 minutes - 1 hours. If it doesn't crash/stop within that time you should be fine. but make sure by playing some games for a few hours... If still no crashes or visual problems your OC is stable.

Priming for 8 hours is pointless.

the_darjeeling · 12 Apr 2013 at 09:00

Thanks for the advice guys, just a few more quick questions, what setting of prime should i use? the normal default torture test? and if it isn't stable at normal vcore what kind of increments should i increase it by?
thanks

edit i just tried upping the CPU ratio to 42 and it blue screened just after windows start up, the vcore was at 1.208 i think. also the motherboard spashscreen disappeared when it was OC'd is this normal?

fishingcat · 12 Apr 2013 at 21:40

You're fine, that's a very low VCore for a 2500k. You'll get a BSOD if you have insufficient voltage to sustain your clockspeed, but there's no hard done by that. So long as you don't overvolt or overheat you'll be fine.

I'd stick the VCore to 1.3V (still pretty conservative) and see how high you can get the multi at that voltage.

Doomedspeed · 12 Apr 2013 at 21:42

To be honest you should be able to get to 4.5 at 1.3, just make sure your LLC is set to limit vdroop

If you didn't understand half of what i just said feel free to ask.

the_darjeeling · 13 Apr 2013 at 00:26

Right i just had a look and for VDroop the only options are Auto or low, i presume i want the low setting?

fishingcat · 13 Apr 2013 at 21:19

Doomedspeed said:
To be honest you should be able to get to 4.5 at 1.3, just make sure your LLC is set to limit vdroop

If you didn't understand half of what i just said feel free to ask.

You should, but that still depends on your chip.

I need 1.4V+ to get 4.5GHz.