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are one of my cores going bad?

post #1 of 12
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I have had mt 2500k @ 4.9 since day one with what i consider to be low voltages(in sig); I never went higher than 65c and when i did it wasn't for long, usually hoverd around 45-50c while gaming, depending the the game. Recently apps have started to crash on me. I droped my oc to 4.1ghz and load voltage to 1.104 and core 0 would crash while running prime 95. I got it to stay stable at least for a few minutes by feeding it 1.176v. The cpu itself ask for 1.185 at stock so i think im safe. i have recently droped my cpu pll voltage from 1.7 to 1.6 and this started happening. would lowering voltage hurt the cpu? Also i think 4.1ghz is a nice speed to be at, i dont think im missing to much, but 800mhz is no insignificant number. This cpu has been at 5.1ghz but i cant get it stable with my cooling. Im sure on a good WC loop i cant get 5.1 with no issues. but core 0 is starting to worry me.
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post #2 of 12
I have to say, I think its probably just thats you are no where near stable, and that you probably need more vcore.

If cpu z is reporting 1.332 load then there is NO WAY you fried one core man

Zero chance ZERO, even if you were running 70c plus 24/7 since release i would highly doubt that it would be possible.

You need more vcore. I also find it highly unlikely that lowering pll caused degradation, ive never heard of lower volts causing hardware failure before. I goes against laws of science.

That said, maybe you should go back to 1.8 or auto voltage and see if that helps stability. I found that lowering pll definitly caused me to be able to bench and stress test longer with unstable voltage, it didnt help gaming much, and I still 0124 until I raised vcore.
Edited by Lex Luger - 3/25/11 at 2:07pm
post #3 of 12
Quote:
Originally Posted by donkru View Post
I have had mt 2500k @ 4.9 since day one with what i consider to be low voltages(in sig); I never went higher than 65c and when i did it wasn't for long, usually hoverd around 45-50c while gaming, depending the the game. Recently apps have started to crash on me. I droped my oc to 4.1ghz and load voltage to 1.104 and core 0 would crash while running prime 95. I got it to stay stable at least for a few minutes by feeding it 1.176v. The cpu itself ask for 1.185 at stock so i think im safe. i have recently droped my cpu pll voltage from 1.7 to 1.6 and this started happening. would lowering voltage hurt the cpu? Also i think 4.1ghz is a nice speed to be at, i dont think im missing to much, but 800mhz is no insignificant number. This cpu has been at 5.1ghz but i cant get it stable with my cooling. Im sure on a good WC loop i cant get 5.1 with no issues. but core 0 is starting to worry me.
More voltage in my opinion. But don't trust me 100% on that. Just sounds like it to me. I'v never ran one of those chips and I haven't done much OCing with CPUs. But I wouldn't be worried about possibly having fried a core, seems extremely unlikely. Hope everything works out.
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post #4 of 12
Thread Starter 
After some playing around in the bios, i got 4.9 stable again without increasing voltage. I tweaked set performance(i think) to energy efficient and it feeds the cpu a little more voltage while at idle which has removed the nagging EADM crash at boot. I also lowered cpu pll voltage to 1.55, everything seems to be working right. Question what does the cpu pll do? is it in control of the bus? if it is stable at 1.55 and maybe lower then why did intel set it to 1.8v as stock. this is most interesting.
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post #5 of 12
Sorry, was reading your post... I noticed you said it was prime stable for a few minutes... that should be a few hours.

If you're running lower voltage than is needed to be 100% stable you will degrade your chip over time, which could account for the issues you've had.

Can you please confirm that you have done signifigant stability testing?
    
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by Crabid View Post
Sorry, was reading your post... I noticed you said it was prime stable for a few minutes... that should be a few hours.

If you're running lower voltage than is needed to be 100% stable you will degrade your chip over time, which could account for the issues you've had.

Can you please confirm that you have done signifigant stability testing?
i do 10 minute test just to see if it get there. i usually let it go overnight while i sleep. i will update again when its done. So lowering pll voltage is bad? so why does everyone lower it? i have personally not seen much differences between 1.55 at 1.8, i was mainly doing this so that I could extend the life of the chip. I guess i will be bringing that voltage up/
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post #7 of 12
Quote:
Originally Posted by donkru View Post
I have had mt 2500k @ 4.9 since day one with what i consider to be low voltages(in sig); I never went higher than 65c and when i did it wasn't for long, usually hoverd around 45-50c while gaming, depending the the game. Recently apps have started to crash on me. I droped my oc to 4.1ghz and load voltage to 1.104 and core 0 would crash while running prime 95. I got it to stay stable at least for a few minutes by feeding it 1.176v. The cpu itself ask for 1.185 at stock so i think im safe. i have recently droped my cpu pll voltage from 1.7 to 1.6 and this started happening. would lowering voltage hurt the cpu? Also i think 4.1ghz is a nice speed to be at, i dont think im missing to much, but 800mhz is no insignificant number. This cpu has been at 5.1ghz but i cant get it stable with my cooling. Im sure on a good WC loop i cant get 5.1 with no issues. but core 0 is starting to worry me.
Set the PLL voltage back to 1.8v.
There's NO reason to lower it. Sometimes lowering it to 1.7v helps shave off a few C's off temps, but the only people who should be doing that are the 5 ghz+ overclockers who are dealing with temps in the 80's. They lower the pll voltage to try to lower the temps, since lower temps=higher stability. But you never know what the drawbacks are.

Some people have to RAISE the pll voltage to 1.9v+ in order to get very high multipliers to work, like X55 (assuming PLL Overvoltage is enabled--which is a DIFFERENT thing than "Pll voltage". If you look in the Intel tech documents, you will see a different PLL voltage shown, which is listed at 1.5v, and that's probably the one that's being "overvolted" to get higher multipliers to work).

And 1.104v is FAR too low for 4.1 ghz load vcore :/ That's a voltage you would expect at 3.4 ghz, not at 4.1 ghz.
Edited by Falkentyne - 3/25/11 at 4:42pm
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post #8 of 12
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Before I updated my bios I was stable for 14 hours with prime blend with voltages around 1.1. I have since cranked the voltage back to 1.8v and placed everything else at the stock voltage. I never have issues with temperatures. The highest I have seen is ~70c and that is when i try for 5+ghz. I have also reverted back to the older bios and all seems to work well. the new bios just didn't cut it for me, caused instability with everything. Im happy with my 4.9ghz @ 1.334v load. Temperatures reach ~64c at most and only when running prime, while gaming the most i have seen is 55c. I think i fixed the issue. turns out with the previous bios even at stock settings core 0 would error our in prime, now i have been going strong for 3 hours and no issues. lets see if i can make 12 hours.
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post #9 of 12
You went to 1.8V on what?!?
post #10 of 12
definitely needs more vcore! increase with a .05 increment until you reach prime 95 stability. I need 1.45v to be fully stable on prime95 blend/ small ffts and Intel burn test on max with 8threads running for 15 cycles. I also have HT on. I can get it stable with 1.4v stable with ht off though
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