Hmm basically both are designed for AM3 CPUs, althought still supporting C2 and AM2. Best to do is to go with AM3 C3 revision. That might be one of the reasons you got problems 720 on them, Gizzud.
My CPU is a C3 - both Gigabyte boards posted okay and ran for a while with no probs, but then died and showed no signs of life after. I think it was probably a board power component failure. Both boards failed on overclock -I was running at around 3.5GHz and 1.5 V at the time - not too drastic and they should have been up for that. The Asus board has been faultless for several weeks under the same conditions.
My system:
750W PSU
AMD Phenom II 720 x3 (all four core released okay - runs Crysis for hours!)
Spire Thermax II - runs at 3.5GHz on Prime 95 at 41*C, idle at 30*C
4Gig Geil dual 1660 DDR3 memory (8-8-8-24)
GTX 260 graphics
I would like to add that I have had Gigabyte boards in the past that have all performed faultlessly, some for years (and some despite considerable abuse...). I was very surprised at the two boards failing with what seemed like the same fault and wondered if anyone else had had a similar experience.
Cheers,
Mick.