I have just bought Quadro FX 4800 and trying to use it in Blender.
The 1st problem : I found that GPU render ( both support and experimental GPU rendering ) is slower than CPU render ( i use Athlon II x4 930 ) . It was a bit shock cuz i though it can never happen.
2nd problem : wenn i turn on GPU render, Blender crash everytime i switch into Live rendering view .
Can some one explain those problems for me ?

i don't want to waste my money on this Fx 4800