Haswell overclock works, then doesn't

I concur
You need to flash the BIOS.
Most likely the CMOS data is corrupt and flashing will clear it out.
 
teppic said:
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.
Click to expand...

yeah true,was just thinking of things you could try,it will run fine with just the 8 pin but adding in the other plugs wont harm anything

one redeeming feature is quality rma with gigabyte
 
Ok, tried the second PSU and the problem's still there. I'll RMA the board.

My ITX system's working fine thankfully - it can run my 4670K at 4.2GHz no problem and I've got an overclocked 7850 in there (the 670 won't fit). Not bad for a tiny system with a 350W PSU.
 
Howdy,
If I were in your shoes, I would do the following:

1) Reset the CMOS (Short the 2 prong jumper with a screw driver rather than pressing the button
2) Remove all power, including CMOS battery and leave it overnight
3) Power up and reflash to the latest official BIOS (F6) using QFlash
4) Set your desired config in the BIOS (Do not overclock anything at this stage) then save this to the last allocated profile location (Called TAG)
5) Press the TAG button on the motherboard near the LED debug readout (Which forces it to use the settings)
6) Try flicking the settings lock button is to 1 (1 is default)
7) Set the TGR switch to 2 (Safe frequency)
8) Power down
9) Power back on

Appreciate your point about not being happy, I wouldnt be either!
Sounds like your temps are getting pretty high, have you considered removing the cooler, cleaning the CPU, replapplying some TP and re-seating your cooler?

If none of the above works I'd RMA the board.

PS, A0 debug code from within windows is OK (Good) - So is 04.
 
Thanks for the suggestions, though I've tried pretty much everything already. I've raised the RMA and they'll pick the board up once I get emailed the courier link.

Now it's time for my third board...
 
1st - Asus Gene, USB ports kept failing randomly, wouldn't start half the time. Fault was confirmed and I got a refund.
2nd - This one, refund coming.
3rd - ?

And my APU has gone missing after I sent it for RMA. So I think I'm cursed.

Maybe I should just stamp on my 4770K (it's bound to fail sooner or later) and get an 8320 :)
 
teppic said:
1st - Asus Gene, USB ports kept failing randomly, wouldn't start half the time. Fault was confirmed and I got a refund.
2nd - This one, refund coming.
3rd - ?

And my APU has gone missing after I sent it for RMA. So I think I'm cursed.

Maybe I should just stamp on my 4770K (it's bound to fail sooner or later) and get an 8320 :)
Click to expand...

Sorry about all your troubles - let us hope it is a case of third time lucky.
 
As a comparison, I've got my 4670K on my ITX board running seti now - it's stable at 4.1GHz with a voltage of 1.118v (!).

sedyB0w.png
 
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Here's my current makeshift PC:

B8x5EoT.jpg


(I've just washed the bottom filter after seeing all that dust)
 
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