lol yeah comparing a 12 pipe (4 real) x1600xt to a 48pipe (16 real) x1900 lol!
you've got 3x the gpu power in pipes alone let alone the 1900 runs at 625-650mhz (xt-xtx) compared to 590mhz of the x1600.
If you're only at 48c loaded you can push it some more by extra vcore. i wouldnt worry about vdroop all that much. Just set a higher initial value so that under load its what you need. When idle your cpu will throttle and be able to handle the higher voltage.
Still i'd of gone with the c2d! at 3GHz the c2d is easily a match for a dual 4ghz 900 series chip, never mind the old 800 series. Pretty much all c2d's hit mid 3G's as well.
I'd tell you what my aq3 score is if it didn't crash at the end
it will be very high.
I hit 54k in 3dm'01, 13k in '05 and 6.5k in '06 all with gpu @ stock
he means 3dmark by futurmark
http://service.futuremark.com/compare?2k1=9028318
http://service.futuremark.com/compare?3dm05=2142627
http://service.futuremark.com/compare?3dm06=416219
note most of those are slightly old as my cpu was at 3.5GHz at the time its now at 3.85GHz