Z68X-UD3H-B3 w/ i5 2500k random lockups in Windows 7 x64

[spurst]

Good luck. I still cant get mine all worked out and I'm convinced its an issue with either this board. I've had the ram in another board and ram memtest on each stick with 0 errors. Everything else tests out fine as well. Its some combination of hardware and this board.

My chip in another board runs stable at 4800  1.38v and in this board, I'm getting issues with it at 4500. The system locked up in the browser still, and sometimes on a cold boot it goes into a reboot cycle sometimes taking 5-10 reboots before it will POST.

I've ended up running with XMP on and manually setting the memory voltage to 1.65v - this seems to get me slightly better stability. I'm hoping a bios update comes out to address some of these issues. I've also been less than thrilled with gigabyte not replying to any of my support email inquiries.

[SG]

Any update on this?   I find myself getting the same behaviour and my parts are very close to yours, the only difference is that the system rock solid until ~2 weeks ago, possibly slightly more.

My parts are:

z68x-ud3h-b3
2500k
Corsair Vengeance 2x4GB RAM
Corsair 550 PSU (not quite sure on model, i think it's a VX)
Nvidia 570 GTX

Like you i've never gotten a crash in a game or a CPU/GPU intensive thing, in fact the 3-4 crashes that I've gotten happened when I was away from the computer.

The crashes started recently, and i've only gotten 3-4 in the last few weeks.   The only recent changes I've done to my system was change my video card from an ATI 5850 to an Nvidia 570 GTX, however this was done over a month ago.  I'm getting the crashes in Win7 and Linux. 

Things i've done to try and fix it:

-update bios from F8 to F10
-disable USB3 in bios
-disable onboard audio in BIOS
-lowering OC'ing, originally at 4.2Ghz, now at 4.0 (scaling back slowly).
-clean out/dust case and rewire everything
-run memtest (did 6 passes, maybe i should do more tho).
-my CPU at idle is no more than 24C, and load no more thand 55C.

I was just curious how your system is now and if you did swap motherboards (and if so which one)?   I was going to grab a newer CPU but i'm thinking of just grabbing a different board now and hoping to find out what you got.  I'm also tempted to put the old ATI card back, but it was a $275 card which is more than the board or CPU that i currently have.

[Dark Mantis]

Hi

After reading through your post the only thing that stands out is that your power supply unit is a little on the low side and so I would start off by looking there. See if you can borrow a 650W + from a good manufacturer to try.

[SG]

a quality 550W is not on the low side at all for a single GPU system, but if it was I would see the problem happening during gaming or CPU intensive tasks, right now it only happens when my system is almost 100% idle.

I might pickup a newer 650 or 700W PSU tomorrow for the sake of it tho just in case, it will be future proof anyways.

[dsmturbo]

  Welcome back spurst

                                  UPDATE

  DMs suggestion re software is actually more likely......follow his advise first......IF it comes down to a hardware issue....follow what's below!

  Before we get to the next phase of trouble shooting, are you running the memory at the stock 1.5V.....if you are ....increase to 1.6V but pay attention to QPI/VTT in BIOS.....it must remain within 0.5V of the memory....this is important (Always!)

                                                       if this also fails.....go to next step!


  Next step on the ladder to knock off is memory.....Download and install to a USB key or burn a disc....Memtest......remove all but one stick in the (Master) slot one and boot of memtest......10 full passes each module (in slot one).....this is time consuming but the only way to move forward.....report back when done with the results

  Aussie Allan

I have been having freezing issues with mine as well. Just loaded Optimized Bios settings. I upped ram voltage to 1.6V but when I try and get the QPI/VTT to within .5V of memory it shows in Pink?