voltages

daz7189 · 14 Feb 2011 at 23:48

hello all

my amd phenom x2 555 be is oc'd to 3.6ghz idle temps 35c - 36c using intel burn test max temp is 64c

just wondering if i could lower my cpu voltage slightly? it shows up on cpuz as 1.400v would lowering the voltage lower the temps at all?

how much could i lower it buy? would it affect the performance

thanks

gcaster · 14 Feb 2011 at 23:57

Lower it, stability test it in IBT (20-30 runs) and Prime Blend (Overnight, 12+ hrs ideally).
If it crashes the your answer is no. If it remains stable then yes.

Repeat this process until you reach your desired/lowest stable voltage.

daz7189 · 15 Feb 2011 at 00:25

thanks for the reply

how much should i lower it by each time? how many . of a volt

gcaster · 15 Feb 2011 at 00:39

Just by the smallest increment available to you. This is usually the recommended way of doing it.

Alternatively pick a point you think should work and test it there. If it works then great, try lower until you reach the desired/lowest voltage. If not then keep taking mid-points until you get there.

Remember, overclocking is am iterative process so just be patient with it.

G

daz7189 · 15 Feb 2011 at 01:42

thanks

lowerd my voltage to 1.387v says cpuz 1 increment down

ran intel burn on 10 passes i got no errors i hit 54c max full load thats a whole 10c cooler

should i lower the voltage even more

is it possible to lower the nb and sb voltages? what would that do

thanks

gcaster · 15 Feb 2011 at 01:56

I'd recommend running more tests than a 10 pass of IBT. You may find temps will rise a bit more than that when running for longer periods of time.
Prime Blend is a must for declaring stability.

Prime Blend it over night and if it's stable repeat these steps tomorrow etc...

I wouldn't recommend changing NB/SB Voltages while changing VCore, you should only be changing 1 thing at a time until the system is definitely stable.

daz7189 · 15 Feb 2011 at 05:08

ok been running prime 95 for 2 hours and my pc got a blue screen ??

any ideas

Emphacy · 15 Feb 2011 at 10:18

BSOD = Unstable bro, whack the Voltage increments up by one and run again, if you BSOD again, it's still unstable.
You could also try raising your memory timings, this can increase stability in some cases.

gcaster · 15 Feb 2011 at 14:54

As above, a blue screen means you're unstable. Was that at the first increment down from 1.4V?

daz7189 · 15 Feb 2011 at 18:06

thanks for the replys

yes it was the first increment down from 1.4v

first prime ran for 1 hour and reset my pc second time got to 2 hours and got the blue screen 3rd time checked back after 2 hours and my pc was repairing windows :\

ive set i back now to last stable point and am running prime95 just to be sure

so could lowering the voltage cause my system to be unstable what could i do to counter that

thanks

gcaster · 15 Feb 2011 at 21:58

If it's at the lowest stable voltage already then the only way you'll be able to reduce that is by lowering your clock.

welshdragon · 15 Feb 2011 at 22:37

Just out of curiosity what cooler are you using?

Whilst finding a nice low voltage is good perhaps a cooler/tim upgrade may be in order?

I run my 965 @ 3.8 with a vcore of 1.425. Idles at 28c and I ahve yet to see it go higher than 48c at full load for over 45 mins.

I'm using a thermolab baram with just one 120mm fan in and antec 300.

daz7189 · 16 Feb 2011 at 03:30

my cooler is a Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler

got it the other day thought i put it in a bit dodgey the first time so took it out and done it properly today

just to compare to the stock cooler my 555 be is unlocked to a tri core and oc'd to 3.4ghz 1.4v

stock cooler temps idle around 36c to 39c prime95 temps 65c+ if i remember correctly

with the new cooler same oc settings

idle 33c to 35c prime95 temps highest temp 55c

anyway ive left on above settings just lowered the voltage to 1.350v if i remember correctly passed almost 6 hrs of prime95 (thats how long i sleep)

idle temps 29c to 31c prime95 temps 45 max

should i up the cpu to 3.5ghz and run prime95 again?

gcaster · 16 Feb 2011 at 03:48

Just take it in steps as small as possible.

welshdragon · 16 Feb 2011 at 08:22

ignore

daz7189 · 17 Feb 2011 at 05:43

managed to get a stable 3.6 ghz with 1.4v survived 20 pass intel burn test and around 6 hrs prime95

seems re doing the cpu cooler has improved temp quite a bit compared to the temps in my first post

3.6 ghz 1.4v idle temps now 30c 31c intel burn test i seem to get higher temps with ibt max 51c prime 95 temps max 49c

tried on 3.7 ghz with 1.425v failed on 2nd pass of ibt got blue screen

should i higher the voltage to try stabilize??

any ideas what i should do?

thanks

welshdragon · 17 Feb 2011 at 10:48

Try 1.450 and go from there. I think the max voltage is about 1.5 roughly and for my mind if you need it that high for small gains you have to balance gain v temp/life

daz7189 · 17 Feb 2011 at 18:52

thanks

failed pass 14 0f ibt at 1.450v

trying now at 1.462v

temps are getting a little high in load now though @ 1.462v temps are hitting 65c with ibt

is there any other way to stabilise without putting the voltage so high?

or do you think ive reached my limit?