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Pros: Runs nice, nice EFI BIOS config options, the specs fit all my requirements - would have been 4 eggs if no loop boot issues
Cons: The loop boot problem for GA-Z68A-D3H-B3 is real. I had my system working fine for more then 5 months untill one day when it started continuously booting every 2-4 seconds, without beep (no POST).
In my case resetting CMOS via jumpers (per manual) didn't work. I removed the CMOS battery for more then 30 min (... and put it back in^^). Still boot loop. The PSU is fine (I had the luxury to test the board with another compatible PSU). I removed every single component (except the i7 CPU and its fan/heatsink) and unsuccesfully tried all memory combinations (I had 4 memory chips) including no memory at all. I bread-boarded the system (basically got it outside of the box and run it on a cardboard) to rule out any shot-circuit with the case. The results: still boot loop and no POST beeps.
Maybe I should try with a different CMOS battery - but I doubt results will change (and even if this is the case and a discharged battery causes such problems on this board I would still recommend you to avoid buying it).
One extra problem - few month ago I had some problems with WiFi (on this machine that was otherwise working fine at that time). The problems happened after I had installed some virtualization software. That's fine I looked on the forums for that software and surprise - it turns out that the issue was well documented and was manifesting only on two Gigabyte mother boards with - one of them being... (you guessed it): GA-Z68A-D3H-B3.
The fix for the motherboard problem was in that case to install newer firmware - which I did using the Q-Flash embedded in the BIOS. The computer still worked for a while after the Q-Flash update. Was that the cause for the boot loop that I am experiencing now? Or maybe it was a driver update for the i7 integrated HD3000 graphics card? I don't know... But another question is raised here - why only the Gigabyte mobo-s had issues with their firmware?
Also - if you want to overclock your board, buy something else - gamers dont use this board - I bought it because I was cheapo and didnt needed a real graphics card (wanted to relay on the integrated Intel HD 3000). The boot loop is not related to overclocking though. This system was never overclocked.
Anyway - maybe you will get luckier then me, however I will not take any other risks with Gigabyte.