I have a voodoo3 3500 that I have tried to overclock but when doing before and after testing with 3d Mark99 Max benchmark program ...even a little as 5 to 10 mhz increase dropped my video marks but it did increase slightly my cpu 3d marks ...i use a amd k6-3 400 running at 450....why would this be>? I have a fan on my card as well....any comments would be nice