hi,
I'm using the same card as the OP here (HD6850) with two different hardware.
One is flash with ATOM15 because i need to plug it directly to the VGA of an MS2930(blast city),
And the other is not flashed (no need, going trought a jammasd), and hooked to a 18" toshiba (capcom cute).
The desktop resolution (640x48i 60hz) is clean for both setup.
I'm just noticing a slight difference with groovymame refresh rate compared to my old HD4890 (emudriver1).
For example with Street fighter 3.3 switchres is choosing a 59.82hz instead of the original 59.83xxx one (was exact for the HD4890 oldemudriver).
I'm alway have few 10^-2 hz less difference for each games for the refresh rate.
Is it a normal behavior?