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2500k @4.5ghz...Got some questions - Page 3

post #21 of 28
Thread Starter 
Quote:
Originally Posted by Falkentyne View Post
This "Degradation" is perfectly normal.
You're stress testing on the "low" end of the vcore needed for stability, and many (apparently not all, but a lot) CPU's wind up losing some of the lowest vcore ceiling from when they are new, or first run at a certain overclock, and slowly need a little higher vcore than initially. This not "abnormal" degradation, but seems to be normal with these chips. Going from 12 hours, to 3 hours, to 35 minutes to a BSOD, is a common symptom.

The chips usually settle after a certain point and remain stable long term. I was able to do two 4.5 ghz 1.260v primes for 12 hours twice, after having degradation when it used to prime at 1.236v, to the point where it would BSOD within 30 seconds at 1.236v (originally ran for multiple hours). This was caused by gaming and stress testing at 5 ghz, 1.404v-1.428v. Hopefully all the voltages will settle down and 5 ghz will need 1.440v game stable (too hot to prime test there now) and 4.5 ghz will even out at 1.260v and not degrade further (any more degradation would be caused by 5 ghz voltages, IF the chip isn't broken in/settled yet, which I'm hoping it will be).

Maybe I'll do some bad company 2 for a week, at 5 ghz, then do a 12 hour prime run a week later and see if it still passes at 4.5ghz, 1.26v or if it bsod's...

And repeated prime testing is fine as long as your voltages aren't too high and you keep the chip cool. You're getting into danger land if you prime > 1.4v unless you have some very good cooling.

well you were correct....the 4.5ghz @ 1.29v was working great...then after about 5 hours of having WOW running and surfing the net and screwing around with looking into ways to OC my gpu a tiny bit...i BSOD...so im now sitting at 1.300v and running a blend test along with having WOW open and running and having the same stuff i had running when it blue screened me...im sorta disappointed that this 4.5ghz went from 3+ hours stable at 1.285 to almost 15 hours stable at 1.29v maybe 1.3v is my lucky number

btw am i seriously hurting anything by running a blend test along with playing WOW and surfing the net?
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post #22 of 28
No its not hurting anything. You just need to break in the CPU to the point where the voltages settle in. The CPU's always seem to need the absolute lowest voltages when they are first installed, then (whatever that minimum voltage was for stability) will stop being stable after break-in....
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post #23 of 28
Thread Starter 
Quote:
Originally Posted by Falkentyne View Post
No its not hurting anything. You just need to break in the CPU to the point where the voltages settle in. The CPU's always seem to need the absolute lowest voltages when they are first installed, then (whatever that minimum voltage was for stability) will stop being stable after break-in....

so how long is this break-in period?

cause not long after i posted my last message...i BSOD again @ 1.300 now im @ 1.305v...i have that funny feeling im not going to see 100% 24/7 stable till like 1.36v and that would make me very sad
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post #24 of 28
Well mine passed two 12 hour primes at 4.5/1.260v, so I'll assume that remains steady unless more 5 ghz gaming degrades it further (as any degrading at 5 ghz/1.440v also affects the lower speeds, although not as much).

My chip started out stable at 1.236v. (and 5 ghz 1.416v) So you can pretty much figure it out from there.

I'd say try 1.325v load and try a 12 hour run. If that passes, you should be safe long term.

I've seen chips degrade by 0.05-0.07v, but that's usually around the 5 ghz level. I saw someone's 2500k go from being able to boot windows (when brand new) at 5 ghz 1.29v, then BSOD on the next boot, and require 1.31v, then it settled at 1.35v for 5 ghz and remained there.
Edited by Falkentyne - 5/15/11 at 5:43pm
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post #25 of 28
Hey Any updates. I am getting the exact same build and will be OC.

Thanks for the help.

Also hows the H60? whats the temps? Did you change the fan and did you add one?

thanks.
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post #26 of 28
Thread Starter 
yeah sure i can update this a little

the cpu was stable from my last post 2 weeks ago at 4.5ghz @ 1.305v and then 2 days ago it BSOD on me while i was setting up a game of Terraria...so i bumped the vcore to 1.310 and its been stable since then...ran 3 hours of p95 and it hit a max temp of 66c on the hottest core

the H60 seems to be performing on par with similar air coolers...i have to say its not the best but its not too bad either....temps under P95 load are about 66c on the hottest core with the rest falling somewhere in between 57 and 64....my H60 is running 2 noctua p12's in a push/pull exhausting out the back of the case...also i ended up changing the TIM a couple times...i wasnt happy with the temps with the stock Shin Etsu that came on the H60...so i removed it and put some AS5 on...that stuff sucked....so i ordered some Shin Etsu G751 from performance pc's and that seems to have droped my load temps from 70ish to the 66 im getting now with a full prime 95 load

as of right now im having a little issue i plan on making a post about...while sitting here watching my temps on realtemp...ive noticed my core 1 which is normally my hottest core is kinda stuck at like 38-40c on idle while the other 3 are in the low 30's....and none are budging from their respective temps...but it could be cause its sorta warm in my house this early in the morning with the sun beating on my window and the computer has been on for 20+ hours running a server for Terraria for some friends

so sans my current little issue which im guessing is just the computer acting normal cause of the ambient and its been running for 20+ hours....it all seems very stable and is running great...games are flying even with my lowly 5670 and things overall are snappy...im very pleased....im hoping the vcore will stay low so i can get a little more head room if i ever OC to above 4.5ghz
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post #27 of 28
prime 95 doesn't really crank up the heat much and takes ages to find faults.
try the lastest intel burn test. you only need to do 20 runs, which is about 1/2 an hour at 4.5 GHz, and if your CPU has even the slighest instability it will show. if u can do 20 runs stable at very high setting (4 GB RAM) then you are good
done this on mine. have to crank vcore from 1.31 to 1.34 for IBT to be stable.
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post #28 of 28
Thread Starter 
Quote:
Originally Posted by james8 View Post
prime 95 doesn't really crank up the heat much and takes ages to find faults.
try the lastest intel burn test. you only need to do 20 runs, which is about 1/2 an hour at 4.5 GHz, and if your CPU has even the slighest instability it will show. if u can do 20 runs stable at very high setting (4 GB RAM) then you are good
done this on mine. have to crank vcore from 1.31 to 1.34 for IBT to be stable.
there are quite a few people on these boards that will disagree with the IBT being more hardcore than blend test...but to be honest it doesnt matter much to me as i tend to run both just to cross reference em with each other to check temps over load and stability

i do agree though that temps get a lot hotter with IBT than with p95
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