i5 2500k vcore

king2104

king2104

king2104

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hello guys my first time posting,

i have a slight problem here.

i overcloked my i5 2500k to 4.5ghz however when using vcore of 1.3..... non of them are stable unles i go into the 1.4... vcore zone, is this safe. so far i have only touched the multiplyer and vcore and ppl setting in bios.

when running prime 95 with a vcore of 1.3.. it fails but when at a vcore of 1.4... its fine.

the big problem i have is when i set my vcore to 1.4.. in bios, in cpuz it says my vcore is 1.332 and in touch bios by gigabyte it says the same but i set it to 1.4.. does it automaticly downclok itself.
 
I think its best to go by the bios value. cpu-z is a sensor reading. Are you sure you need to mess with ppl? Have you set the load line calibration? Makes a massive difference.

Someone correct me if I'm wrong, but my understanding is that on sandybridge chips, <1.325v is reasonable, <1.35v is pushing it, and anything above that will shorten the life of the cpu.

The earlier sandys were better overclockers than what you get now. Mine needs 1.32v to get to 4.5ghz; a tad more in offset mode.
 
hi,

guys very fast reaply,

well this is what i have done now i set back the multiplyer to 4.0ghz exactly and the vcore now is 1.275. jumped into intelburn test set on standerd and it passes now set it on high currently on 8 out of 10 runs and still fine, so i know 4.0ghz is very stable at 1.275 but why do i have to put the vcore so high for it to still not be stable but run. i would really like a 4.5ghz overclok.

the reason i turned on ppl becasue without it my machine would not even get paseed the boot logo at 4.5ghz.

thank you buddy's for the fast reaply.:D:p:cool:
 
Hey and welcome to Overclockers :)

1.275v is hardly high! I need 1.38v just to get to 4.4ghz which is my 24/7 overclock, I think 4.0ghz can be done on stock volts on most chips! But you can normally push a chip to 1.4v with no noticable degradation (if you count your chips lifespan shortening to 10 years from 15-20) and to be honest, that seems like a reasonable voltage. Just up the multiplier before you start upping the volts again. And have fun :p
 
Jokester said:
CPU-Z is more likely to be right than the value that you set in the BIOS because of two reasons, Vdrop and Vdroop.
Click to expand...

Good point!

Are you setting the vcore manually or just letting the mobo do it automatically? The auto settings tend to be higher than what you need for stability.
 
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:cool:hello,

just passes ibt with 4.0ghz fine with a vcore of 1.275 then went up to 4.3 with the same vcore and failed the ibt within a matter of seconds with a bsod.

so im just going to try with 4.3ghz with a vcore of 3.45

temps are fine all under 69 celcuis under load with coolermsater hyper 212 evo installed yesterday with artic cooling mx2
 
hi,

doing it manually dont really like auto as it makes high and pointless vcore settings.

just trying ibt with 4.3ghz and seems to be going well so far trying it on standers with 10 test runs so far done 5.
 
king2104 said:
temps with 4.3ghz and 3.45 vcore are reading at 60 celcuis full load.
Click to expand...

I hope you mean 1.345.

This is what is on the 2500k prduct page on OCUK.

- Do not exceed 1.425v core voltage, doing so could limit lifespan of the CPU
- Aim to keep temperatures below 70c underload if at all possible
- Do not overclock with BCLK, again doing so could limit lifespan of the CPU
- Recommended memory voltage is 1.50v, so make sure to run your memory at 1.50v, higher than 1.60v could limit lifespan of the CPU
- These recommendations come from OcUK and Intel, your warranty is un-affected but we highly recommend you adhere to the above to make sure your CPU lifespan is un-affected
- All Sandybridge CPU's worldwide should be run at the above or lower voltages, no higher!
Click to expand...
 
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hi,

yes sorry i ment 1.345 vcore. but still cannot find a stable oc vcore

i put llc level ro 3 and vcore to 1.37 at 4.50ghz and still it cannot pass ibt on standerd.

please may i have some big help

thank you:)
 
upto 1.425v is safe for sandy, try 1.385v for 4.6ghz as long as you have a decent cooler you should be able to acheive this, ocuk set my vcore to 1.385v for 4.6ghz with my overclocked bundle, just keep a close eye on your temps.
If your vcore drops below your manual setting under load then you can always set your LLC to the next stage up but be aware very high settings in LLC can sometimes push up voltage beyond the manuel seeting in the bios. you can monitor this with cpuz while running prime.

I increased my mulitplier from 46 to 48 leaving the vcore at 1.385 but was getting a reading of 1.4v under load, I just staged down the LLC and although a got a little vdroop it was very stable under 6 hours prime time and i've never had any issues with the overclock. Seriously mate you will be fine if you do not exceed 1.425v but of course get it as low as possible.
What cooler are you using? Also, if you can keep your temps around 70c under load then that would be really good, with a decent cooler though you can get your temps lower.
 
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Start at 4 GHz and find the absolute minimum vcore needed to keep stable using Intel Burn test. Move the multiplier up in increments of 1 and test again. Write down everything you do. This is time consuming but you learn a lot about how your chip scales to vcore and frequency. stop when you reach unsafe vcore or temp - this is how you find the limits of your chip.
 
hi,

i reached a stable 4.3ghz with a vcore set in the bios as 1.36( thats is the lowest it will otherwise ill get bsod in ibt)

but for some reason in cpu-z it reads as 1.320- 1.356.

thank you i was really looking foward to oc this but it all changed last night
 
king2104 said:
hi,

i reached a stable 4.3ghz with a vcore set in the bios as 1.36( thats is the lowest it will otherwise ill get bsod in ibt)

but for some reason in cpu-z it reads as 1.320- 1.356.

thank you i was really looking foward to oc this but it all changed last night
Click to expand...

cpu-z is quite accurate and if you are stable with this vdroop then i'd leave it at that, no need to push up the vcore unnecessarily, unless of course you want to overclock higher.
 
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hi,

i just put the multiplyer up to 45 and the vcore 1.375 and llc level 3 and it booted into windows is that ok?

can i just leave it at that:)
 
My 2500k requires 1.38 volt in bios for 4.6, manual voltage, no energy saving or anything, LLC is at 75% and it means my cpu is all ways at the speed and voltage it is set at.

At the minute I have mine at 1.40v core and 4.7GHz, it seems to like require .2 of a volt for each multi (if that's the right way of explaining, 1.38 = 4.6, 1.40 = 4.7)

I also found that if I let v droop do it's thing it would be IBT and prime stable but blue screen while gaming, so I just use manual and it has cured it.
 
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hyperst said:
My 2500k requires 1.38 volt in bios for 4.6, manual voltage, no energy saving or anything, LLC is at 75% and it means my cpu is all ways at the speed and voltage it is set at.

At the minute I have mine at 1.40v core and 4.7GHz, it seems to like require .2 of a volt for each multi (if that's the right way of explaining, 1.38 = 4.6, 1.40 = 4.7)

I also found that if I let v droop do it's thing it would be IBT and prime stable but blue screen while gaming, so I just use manual and it has cured it.
Click to expand...

Have you tried 4.8 @ 1.4 vcore? maybe you could achieve 4.8 without upping the vcore, worth a try.
 
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