soooooooo.... i have this box more or less working now with the GA-965P-DS3 mobo. with my seagate SATA disks connected to the top two orange ports and the BIOS configured for those ports as AHCI and native, my disk-related xbench scores are in the mid-50's which still seems a little slow to me for new SATA stuff, but i can live with it and have been using it for the past 4 or 5 days.
what i can't live with however is something that i have actually never seen until now. it's this horrific transparent grey overlay that falls down over the screen like a waterfall of death and then pops up a message telling me that i need to reboot.
F--- that.
there seem to be a few very specific things that crash the box dependably, but it also happens at seemingly random times -- and at those times, always associated with some heavy disk activity. discounting possibilities like bad ram or a faulty mobo, that makes me think that the issue is related to the possibly flakey ICH8 SATA support that seems to give people fits with this mobo.
i have tried three different systems (jas 10.4.8 ppf1 clean install, jas 10.4.8 ppf1 upgraded to 10.4.9, uphuck 10.4.9 v 1.3) and a bunch of different kernels, and with and without the ds3-4pack.1.2 patch and i see the same crashes in all cases.
me, i'd rather
switch than fight!

[and i will be very suprised if there is anyone besides me old enough to remember that ad campaign around here... but apple should revamp and spin it and insert it into their current "switch" ad campaign]
so i ordered an asus P5B Deluxe mobo and i am going unbuild the box and rebuild on that mobo using
Mistico86's package for that board and see if i can kiss the waterfall of death goodbye again. then i'll just return the gigabyte.
if no better, i'll take apart and rebuild again and return the asus since it is a more expensive board.
i guess i was very lucky when i first installed osx on my AMD box in nov/06. from then until now june/07, under heavy use, it never once crashed. i mean not once. i literally have never seen that waterfall of death thing until i got this new hardware. it was a total shock to me the first time i saw it. now i am too sickeningly familiar with it...