Unstable Cores during Prime95

[Records070]

Hello,

I seem to have an issues with the Prime95 program if I let it run on Custom with 7500 MB ram? It is running now as I am writing this an every core just seems to be completely off? 3 are running the same "test" and the remaining one seems to have an whole different test running. The 3 cores got a test running with 8K at the end and the third core is running smth with 1024k at the end.

I just want to know whether that means that its hella unstable or is Prime95 doing that purposely?

 

[nikoli707]

prime will say a worker has stop working if a cpu answers a question wrong. when it does that it means its unstable. usually you will just bsod but if it says a worker has stopped, then your probably getting close to stable. not really sure why your running a custom test. if you really want to test for stability then run intel burn test at maximum setting until it finishes. if you can make it through that then run prime95 small fft for about 12 hours and if that passes too then your good to go.

 

[Records070]

Hm alright, well.. I left Prime95 on last night and it ran for a good 14 hours and there werent no Errors or anything after those 14 hours on Small FFT after overclocking it to 4.3 GHZ with a 0,20+ voltage ontop of stock (Gigabyte)

The temps were during that time, averagely
c1: 60
c2: 63
c3: 59
c4: 60

And on idle at this moment they're 26-31

Just curious whether the system can be considering "stable" now and if the temps are not going to shorten the lifespan of the cpu too much? xD

Salute & thx!

 

[nikoli707]

yes thats stable. what were your max temps? looks like you still have much more thermal headroom for overclocking so i would push it up a little more.

 

[Records070]

Well genuinely, I just wanted a little boost, I wouldnt want to break the CPU due to a stupid mistake of mine

but the max temps were: 61 - 65 - 60 - 62

Is heat/temperature the only facture when it comes to an CPU's lifespan though or are there other thigns that I've got to think about if I decide to overclock a bit further?

PS: Its an i5 2500k processor

 

[nikoli707]

i have the same 2500k. i have a cooler master hyper 212 plus and im at 4.6ghz with a 1.360v vcore set in the bios, i adjusted my llc to get an actual hwmonitor reported min vcore of 1.356 under load and a max vcore of 1.380 when idle. when i run intel burn test at maximum it will get to about 83c with indoor ambient temps of about 68f. prime95 after 12 hours only gets to about 79c. im at my thermal limit so i would need a better cooler if i want to push farther. but normal gaming like heavy modded skyrim and battlefield 4 (7950 oc'ed to 1.15ghz) and i rarely get above 74c.

for sandy bridge most agree that for a 24/7/365 overclock, 1.40v on the core is probably the limit you would want to stay at. many choose 1.35 just to be safe but thats a little over conservative in my opinion. if you have superior cooling, 1.40v isn't bad at all as long as your under 80c. that cooler the better, but getting into the 1.45 to 1.50v on the core is going to likely limit the life of the processor. if your watercooled, its very likely that a 2500k at 1.48v running 5.0ghz will last about 3 to 5 years at the very least. but over time the processor will need higher and higher voltage as the internals of the chip will age much quicker than normal.

stick to seeing if you can get to 4.6-4.7ghz and stay under 1.40v and keeping temps below 80c under full stress.