Overclock unstable over time?

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I'm just looking for some advice on my CPU overclock that I did when I first built this comp in early 2013.

3570k OC'd to 4.5ghz on 1.19 vcore according to bios
Ran this for 8hrs+ back then in P95 and never received any errors or failures.
Seemed stable and never had any problems.

In the last few months I had a few blue screens, never caught what they said, but haven't had any since I switched out my 7870 to a gtx 970, so maybe it was GPU related?

Anyways, three Prime95 tests in the last few days have all resulted in Worker #2 resulting in an error within 1hr of testing: "FATAL ERROR. Rounding was 0.5, expected less than 0.4". Temps reach about 68-70 after 1hr. I've been playing games without any issues.

Quick bit of research suggests it needs more vcore. Which I plan on doing, but I have a few questions.

Firstly, I take it your overclock can become unstable overtime simply due the slow degrading of components? Or was this upping to a GTX 970 that changed something?

Secondly, CPU-Z say's my core speed is 4500mhz when running P95 (or in any games) but the core voltage ranges between 1.168v and 1.174v, even though It's set to 1.9 in bios. And when core speed is at 1600mhz the vcore is 1.184v. Is that normal?

Thirdly, should I be aiming for higher with this chip or just get it stable at 4.5ghz and leave it be?

Thanks for any advice you guys can give :)
 
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1.9v on BIOS is way too much for CPU voltage,you sure?

Blend test tests ram aswell could be that or vccio voltage
 
It's ridiculous how quickly I just rushed to BIOS to check. As soon as you said that I was panicked even though I was sure I couldn't have been running it on 1.9v for 2 years lol.

But yeah missing digit, it's at 1.19v :)
 
Nevermind. A quick IBT at maximum and a BSOD signified I wasn't stable at 1.19v lol.

Upped it to 1.25 and it ran fine, never exceeding 80c.

Noob question: Will a GPU overclock to my 970 in anyway effect the CPU OC? Or are they completely separate as long as the PSU can handle it?
 
it shouldn't affect things,your more powerfull gpu might push your cpu and memory a little harder though
 
goes to show how pointless prime95 is for stability testing compared to an actual tool built from the ground up to stress the cpu like linpak.
 
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