Nice post, Just the infomation and confirmation I have been looking for on ACC.
I recently purchased a 955BE (coming form a 9850BE) and have managed to get the 955 stable
For gaming and benching at 225x17 NBx12 HTx10 DDR@1066
3825/2700/2250/1200 (1.45/1.25/1.2/2.1 v)
And was looking for for a way to get more stability with higher overclocks
The two remaining things in bios that are a bit of an odd mystery for tweaking for me have been the skew and ACC for the quads i have tested.
every quad I've tested had different skew and each quad 9950 9850 940be and this 955 I have right now have had different ACC settings when set to auto.
I have a feeling that ACC & skew are linked to the clock multi for the CPU

Note following tests on M3A79T (790FX)1102 bios


Stock Clocks all options auto

e.g
940BE skew auto: channel a=300 delay b = 450 delay
955BE skew auto: channel a=150 delay b =300 delay
9850BE skew auto: channel a & b= 300 advanced (from what i recall)
Tested On UD4P (790x) as only board i have tested that shows you values for auto setting
9850 ACC: auto = +2
9950 ACC: auto = -2

Questions I have to ask are what CPU are you using dave, and rest of posters in this thread, and what are the default ACC setting & skew setting using Auto option.

Would be nice to build up a profile for these settings with phenom's
It may prove to be nothing but theres a link in the settings & product there somewhere I am sure of it.
sorry to hijack thread a little , but are not skew and ACC linked in thoery or at least provide a similar effect?