Originally Posted by adaemus
This has been a great guide and I've done my best to follow it to the letter. I have an issue though and after reading through 30 some odd pages of this thread I am still unclear so figured I would create an account and ask. Apologies on the length of the post but I wanted to provide as much detail up front as needed.My System
MB: Asus Maximus V Formula
Memory: 2-8GB Corsair Vengeance 9-9-9-24 1600 Mhz
Cooler: iH80Short Story:
Getting Prime95 Worker failures after couple of hours of running (the rounding error...got .5 but expected under .4....). Trying to OC to 4.6Ghz following the original post instructions and currently at vcore of 1.300. Do I need to continue driving my vcore up for this OC or should 1.300 be sufficient? Could my RAM be causing this issue?Long Story:
I just put this system together this weekend. After getting everything up and running I wanted to try out some overclocking. I noticed that the Asus AI utility had a "CPU Level Up" feature and thought "cool, this is going to be easy" so I selected the 4.6 Ghz OC and within a minute I was OCd to 4.6 Ghz. I went about my day but something was bugging me...the Asus AI Sensor recorder was saying that the CPU temp was only 55 *C which sounded way to low. So, I started googl'ing.
I learned a couple of things pretty quickly. 1) the AI Sensor Record feature is not accurate 2) I should not be using any software to OC but do it manually in the BIOS for various reasons, mainly that software OC will set the voltage higher than what is needed. I checked what the OC software had set voltage too and I want to say that CPU-Z was reporting it at around 1.358v for the 4.6Ghz OC (but it may have been 1.385v...I didn't write it down).
Anyway, I set everything back to default and then followed this guide to the letter (well, as much as I could since the Bios is very slightly different than the one used in the original post). I set the OC to 4.6 Ghz and originally had the vcore set to 1.200. Wouldn't even boot. Increase it to 1.210 and booted but Prime95 crashed within 10 seconds. Upped a few more, dealt with a couple of BSODs and other program crashing but finally ended up around 1.250v and the system seemed pretty stable.
I was happily testing in Prime95, not seeing it crash at all but then I noticed one of my cores was not pegged at 100% anymore, it was a bit lower. Looking at the Prime95 screen there was a "fatal hardware failure" rounding error (was .5 but expected to be under .4). This caused that core's worker to stop running. I now assume this is what is meant by "Prime95 failing"...is that correct?
I've bumped up the voltage to 1.290 last night and after 30 minutes of running I decided to let it continue all night. This morning I checked and I had lost four cores over various points in the wee morning hours. I bumped the voltage up to 1.300 and set it to running again and headed off to work. Just had my wife check and in the last four hours I've once again lost four cores.
My CPU temps are typically in the mid 70*C range with one of the cores hitting 80*C occasionally so I don't think temperature is the problem. I've read plenty of posts here with people OC'ing at 4.6GHz successfully with vcore voltages under 1.300 (many near the 1.260 range).
So do I just need to continue bumping the vcore or could there be something wrong with my RAM? I haven't considered the RAM b/c I'm just running it at stock values but I wouldn't have thought I'd need to go over 1.300v to achieve 4.6Ghz. Any assistance provided would be greatly appreciated.