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Haswell Overclocking Guide [With Statistics] - Page 1162

post #11611 of 19580
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Quote:
Originally Posted by treome View Post

I did some further testing. 1.280v @ 4.5ghz seems stable so far (IBT 20 loop high) if I completely disable C-states and EIST. Is it normal for C-states and EIST to cause instability for Haswell? I've read contradicting things..

Nobody seems to have experienced significant enough change in stability on Cstates (less people use EIST) to notice something like that.

 

We could run a few tests to check it out though. Do the old' test. 5 runs x264, check average time until Bsod with vs without Cstates.

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post #11612 of 19580
It does not usually affect clocks/volts

Have you tried doing basic stability testing with x264? Link in OP, i think.
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post #11613 of 19580
Quote:
Originally Posted by Cyro999 View Post

It does not usually affect clocks/volts

Have you tried doing basic stability testing with x264? Link in OP, i think.

Is this version of x264the same as the one linked in the OP? I just ran the benchmark and it passed. Also tried IBT 20 loop again and it passed. I will be trying prime 95 shortly.

EDIT: Failed prime 95 pretty quickly. BSOD ~10 mins small FFTs.
Edited by treome - 4/3/14 at 8:22pm
post #11614 of 19580
Thread Starter 

The one linked is 5.0, but there is an extra experimental version which increases CPU load by a bit. The effect isn't major though. The zipped downloads should include everything required to set up x264.

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post #11615 of 19580
Quote:
Originally Posted by treome View Post

Recently did a 4770K build with a custom loop but my chip seems to be a terrible overclocker. It's delided with CLU on die. Does 4.5 Ghz @ 1.298v VID (~1.306 v load) 50 loop IBT stable and 12 hour prime95 but at 4.6 @ 1.35 VID it fails prime 95 after ~2 hours. I haven't tried to push the chip more than 1.35v because I'm worried about degradation.

Anyone have any OC tips for z87-UD3H gigabyte motherboard? I updated to the F9 bios and didn't really notice much difference.

I am considering resealing the die and shipping it back to Intel lol.

EDIT: Batch is MALAY L312B345 if anyone is wondering. I specifically picked out this chip from my local computer store because people were showing good results with early MALAY batches. I think I just got unlucky.

Since you're on a Gigabyte motherboard you may have ran into the same problem that I did.
Quote:
There is only one setting for ringbus in my BIOS and that is set to x34. In my previous post I said I tried disabling turbo and it didn't do anything.

Thanks for the fast responses smile.gif

UPDATE:

Ok, tried running x35 multiplier for ringbus and it showed correctly 3.5GHz in CPU-Z. Then I switched it back to stock x34 and CPU-Z shows 4GHz. This is quite clearly a bug in the BIOS.

Check that your northbridge reading in CPU-Z is at stock (3.5GHz for 4770K?), if not, then either bump the uncore voltage or set the uncore multiplier one higher or lower than stock. Hope this helps smile.gif
post #11616 of 19580
Quote:
Originally Posted by Tuxi View Post

Since you're on a Gigabyte motherboard you may have ran into the same problem that I did.
Check that your northbridge reading in CPU-Z is at stock (3.5GHz for 4770K?), if not, then either bump the uncore voltage or set the uncore multiplier one higher or lower than stock. Hope this helps smile.gif

The northbridge was at 4.0ghz at stock/default lol. Thanks! biggrin.gif
post #11617 of 19580
Quote:
Originally Posted by treome View Post

The northbridge was at 4.0ghz at stock/default lol. Thanks! biggrin.gif

You're welcome biggrin.gif
post #11618 of 19580
Well, I give up.

I'm back to stock. Hopefully everything will be OK. I suppose it's no big deal though. Everything's under warranty anyway. biggrin.gifthumb.gif
post #11619 of 19580
I thought that was common knowledge? Its why I had mine hard-set at 35x initially (and then 37x).

This is default Intel behavior - one of the things Sin emphasized in his GB guide.
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post #11620 of 19580
I finally activated my copy of Windows 8, but I need +.07 Vcore for it to be stable compared to Windows 7. I know Win 8 is finicky with overclocks, but that's odd.
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