This what i've discovered after i've bought this card....
My old 128 mb was as faster as this one...because had 128 mb and 128 bits!...this VTX is a low profile, slow, choopy product with only 64 bits. It's a non quality product with 512 mb just to get some people buy and not see any real improvements...
I've just bought a ATI HD 3850 AGP with 512mb and 256 bits! to replace this VTX card and this is real talking. Highest resolution possible on screen, video editing in a old P4 3.0 and works perfect with HD video.
So...check bits for your graphic card before you buy a new one.