Which driver and operative system are you using for your Voodoo3?
Of course, amigamerlin 2.9 in win98SE
Win98SE and the Amigamerlin 2.9, sometimes the 3dfx 1.07.00 or the beta driver 1.07.00b
XP pro + sp1 and Amigasport 3.0 XP. Everything OK and rock stable.
V3 1000 8MB SGRAM AGP : Win98SE, dunno which drivers since it is not in the PC
V3 3500 (not TV) w/tv-out: Win98SE, original drivers from the net (3dfx).
WIN98SE 1.07.00b + Vcontrol. Very good for DX8.0+ games