Overclocking X58

[yesyesufkurs]

When I overclock my Xeon E5649 by highering the base clock, and highering my voltage, I'm only able to overclock it to 3.4GHz with a voltage of 1.35V and the temperatures will be very high while stress testing.

When I try to overlock it with leaving the voltages on auto, I'm able to overclock it to 3.9GHz, and the voltage that CPU-Z and HWMonitor show are only 1.216V, the temperature will be much lower too.

 

How can this be? And is it safe to just leave everything on auto like this?

 

Thanks!

 

System:

Intel Xeon E5649

MSI X58 Pro-E

GTX 1060 6GB

8GB DDR3 RAM

 

Attachment is a screenshot of CPU-Z and HWMonitor while stress testing with Prime95

[Jurrunio]

you are thermal throttling when you use 1.35V. That's why you couldnt get high clock speed there.

[Rallenhayestime]

adding to what the last person said, if you want any kind of good overclock on x58 you're going to need a 240mm liquid cooler. I had an h100i GTX and an X5660 and easily did 4.4GHz, but could do 4.7Ghz under the right circumstances.

[yesyesufkurs]

1 minute ago, Jurrunio said:

you are thermal throttling when you use 1.35V. That's why you couldnt get high clock speed there.

Yeah, but when I'd just try to OC it to 3.9GHz and set the voltage to 1.216V manually, it won't even post, so why does this even work?

[Jurrunio]

1 minute ago, yesyesufkurs said:

Yeah, but when I'd just try to OC it to 3.9GHz and set the voltage to 1.216V manually, it won't even post, so why does this even work?

you didnt take vdroop into consideration. You need to type in a larger number for the actual vcore to be 1.216

[yesyesufkurs]

1 hour ago, Jurrunio said:

you didnt take vdroop into consideration. You need to type in a larger number for the actual vcore to be 1.216

Oh okay, that makes sense. Thanks!

[Ground]

1 hour ago, Rallenhayestime said:

adding to what the last person said, if you want any kind of good overclock on x58 you're going to need a 240mm liquid cooler. I had an h100i GTX and an X5660 and easily did 4.4GHz, but could do 4.7Ghz under the right circumstances.

You don’t need a AIO, a decent air cooler has less failure points and works just as well. I’m using a Brocken Eco here (30€ cooler) and I’m running 4.4 daily too, though I’ve benched the CPU at 4.7-5.2 with this cooler...