I mounted my A7N8X last weekend. Dropped the NB heatsink and put my twinplex waterblock on it, fits nicely. I'm still using my old Maze2 for the CPU, since my TC-4 has not left the shop yet
Using Corsair XMS3200, my TBird 1GHz AXIA went up all the way to 200MHz FSB (sync mode), with a 7.0 multi = 1400MHz stable under W2K and 3DMark. RAM timings are @ 2-2-2-4. Temps are MB->32°C CPU->36°C (whatever that last one means... i don't know where the temp probe is). All this in a system equipped with 1 PAPST 4412 N/2GL on a D-Tek HC, and a modded PSU (Seasonic 400W with a PAPST 8412 NGML). It means, very quiet.
I'll try the 7.5 multi but i doubt my old tbird can handle 1.5GHz...
The mobo doesnt run hot, i was even surprised by the memory which was very cool (compared to the mem on my GF2 GTS -> burnin' hot, even with heatsinks). The south bridge is rather cool to the touch, so i don't see the need for a HS there.
Overall i'm very pleased with this MB. 200MHz FSB with uber aggressive timings... It's christmas
Airspirit: why not a GF4 ? (i'll get one when the FX is out, so i won't pay too much...)