Hi, I am planning on upgreading my graphics card for my PC (AMD Athlon 64 X2 6000+, MSI K9N SLI, GF 8600 GT (256 mb), 2gb ram, BenQ 20" LCD, power supply Fortron 500w). I am thinking about 4870 HD. What do you think ? Would any component obstruct the performance of the card ? Would i need extra cooling fans ? What would be another option for graphics card to buy ? Thx .