well, the V4 is the half of the V5.... half memory, half anti-aliasing, half VSA-100 chips
. but since a V5 is too big for your PC, it's still a great choice! (full HWFB on glide64!) I have a V4 PCI, but I dunno, I know I'm not using it and I know that I think I'm going to sell a part of my collection, but I'm still not sure about the V4.