I7 4790k Manual Lower Voltage - Good Temperatures?

[DutchMike]

Howdy great peeps,

I ran some tests with Prime 95 26.6 on my I7 4790k (4.0 Ghz),
I found that the temperatures were a bit high (78c), on a Vcore voltage of 1.208.

After browsing online, I gave a shot at giving it a Vcore voltage of 1.000 (1.016),
I've been running Prime 95 for 5 hours now and there has been no errors of any kind.

And the temperatures don't go higher than 59c (my CPU cooler is the H110).

I'd assume that these are good temperatures?
And the CPU works as intended?

Kind regards,
Mike

 

[ShadyHamster]

59c is great, I'd be doing a 12-24hour stress to make sure its 100% stable.
For stress testing 78c is still perfectly acceptable too.

 

[DutchMike]

I've stress tested it using Prime95 for more than 24 hours now, so I suppose I can say it works as intended?

 

[mdd1963]

Generally, temps get as high as they are ever going to with Prime within 30 minutes....

If it's stable with everything else, try running it at the reduced core voltage then...

Gaming temps will never approach those temps anyway...

 

[BFG-9000]

Load temp is great, and 24h stable is stable enough for general use. At least, if you are not going to use any software that uses AVX (Prime95 26.6 is the last version that does not test this which is why it runs cooler than later versions).

Personally, I would also run Prime95 on a single thread to test if max turbo of 4.4GHz (up to 2 cores) is also stable. If so, that's great! Haswell chips tend to degrade more easily (due perhaps to the on-board VRM) so generally the cooler and lower voltage you can run them at, the better.

One of the few good things to come out of Microsoft's telemetry though is the realization that even computers running at stock speeds and voltages have a measurable error rate, which either underclocking or overvolting from stock improves upon. So as undervolting is a form of overclocking, I would not go under 1.016v even if no errors are found, as no test verifies every possible access pattern or computation there is.