Help optimising for Haswell OC

[EmmEff]

Hi,

Please see my signature for hardware.

I've got my Haswell OC'd to 4.4Ghz @ 1.25v. OCCT aborted test after an hour due to one of the cores exceeding 80 degrees. I've created this thread to see if I can optimise my cooling set up.

I'm currently using Corsair H100i and I'm not sure it's set up properly via the Link2 software. I've created a custom profile that is basically telling the 2 intake fans on the rad to run on "balanced". Shoud I be linking the fans to certain temps to trigger 100% rpm? If so, how do I do that? I'm finding the Link2 software a bit cumbersome and buggy.

Once I set the H100i to optimal settings for an OC rig, I'll discuss my case fans and any other cooling options.

Many thanks in advance.

 

[jamesriley94]

80 degrees C is perfectly acceptable really.

Can you get the voltage any lower than that?
1.25v is a little high for 4.4ghz on Haswell.

 

[EmmEff]

80 degrees C is perfectly acceptable really.

Can you get the voltage any lower than that?
1.25v is a little high for 4.4ghz on Haswell.

I didn't realise that was acceptable!

Ok, 3 questions and I'll be on my way...

1. What temp should I set OCCT to abort at?
2. What increments should I start bringing the voltage down (0.01, 0.05 etc)?
3. What is my likely "target" voltage?

 

[jamesriley94]

I didn't realise that was acceptable!

Ok, 3 questions and I'll be on my way...

1. What temp should I set OCCT to abort at?
2. What increments should I start bringing the voltage down (0.01, 0.05 etc)?
3. What is my likely "target" voltage?

Put the voltage down to say 4.5ghz @ 1.1v, and work your way up by 0.025v until stable for 12 hours on OCCT/Prime95. Then after it is stable, reduce volts by 0.005v until no longer stable to find the lowest voltage you can be stable at.

It's impossible to give you a likely target voltage since every chip is different.

Temperature wise - Intel chips can go to 105 degrees C before auto shut off and throttling kicks in. I personally wouldn't set OCCT to abort, as if your at 1.25v and only getting 80 degrees C, then things won't get worse from there. I'd just keep my eye on temps, rather than setting it to abort.

 

[EmmEff]

Put the voltage down to say 4.5ghz @ 1.1v, and work your way up by 0.025v until stable for 12 hours on OCCT/Prime95. Then after it is stable, reduce volts by 0.005v until no longer stable to find the lowest voltage you can be stable at.

It's impossible to give you a likely target voltage since every chip is different.

Temperature wise - Intel chips can go to 105 degrees C before auto shut off and throttling kicks in. I personally wouldn't set OCCT to abort, as if your at 1.25v and only getting 80 degrees C, then things won't get worse from there. I'd just keep my eye on temps, rather than setting it to abort.

Best I can get is 4.4Ghz @ 1.23v. I've just run OCCD for 2 hours, and temperatures where in the high 60s / low 70s and peaked at 78. Seems to be stable, but I'll run through Prime95 for a couple of hours and OCCT overnight to prove stability.

Thanks for the advice, saved me messing with fan settings for hours!