hi, I am going to upgrade my graphic card to ATI 5770 so I need a new power supply which has power about 550--600 watt. But the most frustrating problem is that I failed to find a proper power supply with the correct dimension. I have an HP pavilion e9300 which uses a very wired power supply tower-150mm(W) 86(H) 140(D). But so far all the PSUs I found is the standard size --150mm(W) 86(H) 150(D) which cannot fit in my setup. So could any PC God give me some suggestion, please?? Is any PSU with the size of my tower or can I just simply install a bigger PSU which can still successfully power up the comptuer? Thx in adance.