Haswell overclock works, then doesn't

Yeah, just tried the backup BIOS and it works. Switched it back and it's working ok now.

This is all weird. I think the board may be faulty.
 
I get hiccups with the BIOS sometimes on beta bios's,final bios's don't have any issue

Issues like saving bios settings
 
It's a stable BIOS release though. Everything was working fine, then overclocking went funny earlier. It was only at 4GHz when it powered off - which is a very low OC.
 
It can currupt things if it crashes badly,leaving it powered off for a while or a longish cmos clear puts it right,sometimes it will corrupt the BIOS itself and won't boot so you have to switch to backup and reflash the main

It's a pain but only happens with a bad crash sometimes,just see how it is now over the next few days,I dont think the boards faulty
 
It's just that the board has inexplicably become worse at overclocking and it powered off for no reason. I've not flashed the BIOS so it looks like it became corrupt when it powered off. I'll see how it goes, but something seems up to me.
 
I might even be tempted to take the bios battery out overnight and then re flash the main bios again. After flashing boot in to bios and set defaults save and exit - then boot up again and re set all your usual settings in bios. I would try running for a short while at default clocks and if ok, would then try your overclock again. Dont forget to set ram values or use XMP for your ram settings.

See how you go from there. If there are still problems then a reconsider will be in order. Just as a matter of interest what cooler are you using - is it overtightened as this can cause all sorts of problems. Post back and let us know how you go.

Mark
 
It was running ok, but the same happened again. Powered off and wouldn't start beyond the UEFI screen. Flicking the BIOS back fixed it again.

Pretty sure the board is faulty now.

Now my CPU is showing 100% throttling at 35C and won't go above 800MHz.

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Yup. I was getting the no-start problem again. I reset the BIOS, started up and noticed it seemed really slow.

I've taken out the graphics card, reset it again, it's still booting up with 100% throttling at 800MHz.
 
I have no idea,no experience on haswell either but somethings amiss

could be the board its rare for cpu's to play up

try reflashing the bios in qflash see if that sets things right other than that idk
 
have you reflashed the same bios though? sometimes reflashing cures it if its stuck settings,does on gigabyte z77 anyway

EDIT: any error codes in the led clock? successful boot should read A0 for a ok
 
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It reads A0 when it gets to Windows, but it's still stuck at 800MHz, and when it powers off it won't start again. I didn't reflash the BIOS, but the board has two BIOSes, the original is untouched.
 
I tried a second CPU in the board, exact same result. The other BIOS can't be corrupt as I've never used it, it's the BIOS that shipped with the board and you have to flick a switch to enable it.
 
id still reflash the main bios just to see if it fixes anything if not id rma the board

either go through ocuk or gigabyte uk which are in Milton keynes
 
I can reflash it, but it seems a bit pointless when the BIOS I've never used before is showing the exact same problem.

The only other thing to try is another PSU. The Seasonic one I've got is high end and I doubt that's the problem, but I've got a mini-itx system and I can plug the power cables into this board to try it.
 
I'd RMA the board if trying the other system doesn't yield what you want.

I had troubles with my Gigabyte one too.

I think you've got some horrific luck.
 
it will flush the cmos too and dmi data pool when you reflash,i know what your saying but you know how quirky motherboards can be

yeah psu is another possibility

what cpu power plugs are you using? just the 8 pin or 8 pin plus the 4 pin? might help with all of them plugged in
 
I'll try a reflash just to rule it out. The thing is whether it works or not it I'm unhappy with all the problems it's given me and just want to RMA it now.

I've got the 8 pin plugs in. You definitely don't need both for running at stock clocks - that's for LN2 type overclocks.
 
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