High 24/7 overclock temps question

Akagi · 2 Jul 2013 at 19:14

Hi 8 Pack,

If I were to run an i5 2500K at 5GHz with 1.42v at 100% load for around 8 hours a day, 7 days a week (with the system being used normally the rest of the time - not being turned off), what temperature should I be aiming to run the chip at to avoid degradation?

Or is 1.42v too high to run at 100% load for such long periods of time without degradation?

Cheers

Rooster212 · 2 Jul 2013 at 19:45

If you can keep the temps down, I'd say 1.42v is acceptable, but bear in mind it will degrade quicker! I'd say below 75 or 80 degrees. But obviously you want 8 Pack's opinion

Skeng · 2 Jul 2013 at 19:47

I think the recommended maximum by OCUK for this particular chip is 1.42v and even with that you're looking at some level of degradation. I find that once you start to go over 4.6GHz it requires an annoying amount of volts to get to 4.8 or 5. Maybe that's just my chip though.

Anyway you should probably be aiming for around 60c for 100% load or less.

Akagi · 2 Jul 2013 at 19:53

I might see what voltage is needed for 4.8GHz then. I don't really want to degrade the chip if I can help it, I would prefer to keep it for a reasonable amount of time. It had previously been running at 4.7GHz with 1.377V.

8 Pack · 2 Jul 2013 at 20:55

If your stable at 1.42v and 5ghz then cool go with that. With H100 temps shoul dnot be an issue with Sandy.

How I do it is when the CPU needs loads of extra volts to get it stable. I stop one notch back.

Akagi · 2 Jul 2013 at 21:39

This is all hypothetical at the moment.

8 Pack · 3 Jul 2013 at 09:38

Try man!!!

Akagi · 4 Jul 2013 at 21:21

8 Pack said:
Try man!!!

I will I will, as soon as I have an OS installed

I did get into the BIOS at 4.4 with 1.1v though. I dont know if that is an indication of anything. :rolleyes:

8 Pack · 4 Jul 2013 at 21:34

I did not bin 2500K ever mate so I am not sure about good boot in volts.

Akagi · 4 Jul 2013 at 21:36

8 Pack said:
I did not bin 2500K ever mate so I am not sure about good boot in volts.

Ah OK no worries

I'll have a play and see what I can get.

Akagi · 4 Jul 2013 at 23:57

Currently at 4.8GHz (48x100) with 1.4v offset and LLC on high (voltage usually hovers around 1.38v)

Running prime95 Blend temps are hovering between 60°C and 65°C (they peaked at 68°C on a couple of cores and then gradually went back down)

When it comes to overclocking I know the basics, but that's it. I have left all other stuff alone (all the C1/C3/C6 stuff and PLL and other things which I dont understand) - is there anything I could/should do do bring those temperatures down a tad more?

*edit* after about 30 mins its closer to 70 now, but I am pulling the warm air from inside the case, out through the top of the case, in a warm room, on a warm day.

*edit again* it failed after an hour - by failed I mean BSOD then re-start

Any help appreciated

8 Pack · 5 Jul 2013 at 10:12

Is prime the main use for your rig?? If not an hour is more than enough. Just use the rig or push it further.

With SB leave IEST enabled, but disable C States, leave Spread Spectrum on. Try tuning PLL volts down. This often helps on SB.

Your temps are fine so dont worry about that.

Akagi · 5 Jul 2013 at 10:44

8 Pack said:
Is prime the main use for your rig?? If not an hour is more than enough. Just use the rig or push it further.

With SB leave IEST enabled, but disable C States, leave Spread Spectrum on. Try tuning PLL volts down. This often helps on SB.

Your temps are fine so dont worry about that.

I currently have: 48 x 100, 1.4v offset, LLC on High (1.38v~ under stress), VRM spread spectrum enabled, PLL overvoltage enabled. All other values such as C states, base clock, power limts, current limits, PCM/PLL/VCCIO voltage, spread spectrum and so on are on their default/auto values.

Folding is one of the main uses, and I would like to fold on the CPU if possible, so stability under extreme loading is essential really.

I'll try doing those things later, cheers 8 Pack

How much should I bring the PLL voltage down by to begin with? And do I disable all C-States?

Akagi · 5 Jul 2013 at 13:19

Currently running Blend again with:

48 x 100
1.4v offset (1.37 - 1.38v under stress)
LLC on High
VRM & CPU spread spectrum enabled
PLL voltage on 1.75 (default = 1.8)
PLL over-voltage enabled
C1E, C3 & C6 states disabled
Phase control 'Extreme'

CPU current capability, power settings, current settings, VRM frequency, duty control, VCCIO/PCM/DRAM voltages and other stuff on default/auto.

All is well 30 minutes in, here's hoping it stays that way.

*edit* failed (BSOD - Auto restart) after 70 minutes

8 Pack · 5 Jul 2013 at 14:42

Blend who care??? Come on man just use the PC all your showing is it can run prime. Play some games etc stress it that way much more fun.

Akagi · 5 Jul 2013 at 15:14

Yeah but I want to use the system for folding, which will put a-lot of strain on the CPU. In my last system, folding strained the CPU even more than Blend in some cases, which is why I want to make things Prime stable

The PC will be used for gaming as well, but it will be folding at night, all night, every night.

Trying 4.7GHz with 1.38v offset, LLC high etc etc now.

8 Pack · 5 Jul 2013 at 16:00

Well fold then!!! Prime is pointless in your case as your main use is a stress prog in its self. Just fold for testing.

Akagi · 5 Jul 2013 at 16:32

8 Pack said:
Well fold then!!! Prime is pointless in your case as your main use is a stress prog in its self. Just fold for testing.

Fair point, I shall

Akagi · 6 Jul 2013 at 15:35

Folded for 10 - 12 hours straight with no issues, and then got a 0x124 BSOD while on Youtube (after the system had been off for a while and turned back on again) :rolleyes:

Bumped the VCORE up by 1 click.

8 Pack · 6 Jul 2013 at 19:07

Yeah by two clicks. See what I mean though about stress testing being about variety and using your PC for what you use it for!!! also VCCSA up a couple of nothches.