Hi Maybe I'm missing something here but have upgraded my graphics card and Power supply and If anything the rendering is slower can you help or point me what Ive done wrong Thank You

Computer

Win XP  directx 9c

AMD 3.4Ghz  Phenom II x 4 965 processor

4GB RAM

Geforce  9500GT    Upgraded to GTX 570

PSU was 450 Watt now Corsair GS600 Watt

Sorry forgot to say S 14 Ultimate