I did run 1m @ 483mhz fsb, this is less then 500mhz fsb and your's is 32m, but mine is at multi 9 and with just 1,9v vmch, no vfsb mod yet

My Setup:
E6600@ 1,58v vcore Single stage cooled
DFI Infinity 975X met Vmch mod @1,9v (NB air cooled)
2x1gb Gskill pc6400HZ @2,35v
Sapphire X1900XTX