Need a powerful graphics card for my single slot

Here I am looking for a powerful graphics card for my single slot PCI Express 16x not far from high enough capacitor and a dual slot will block it, I have experience with a sapphire HD 4850, which not ... I can not change. The machine is HP Compaq dc7900 Convertible Minitower

Before we advise a graphics card powerful and compact, is your food ready to bear a substantial burden?

Yes there will be no worries. I have a C2D 5200 and a sata hard drive with 365W power supply and there is enough room.

Hallmark of HP but good power supply anyway if I find a graphic card for singles slot greedy and that I have to change the power supply I would.

There is a HD4850 sapphire single slot and dual slot, which you had?

Your power supply displays cmb of amps on the 12v, you will quickly see if it is a true 365W ... or not

12v -> 12A

Yes but when I had ordered there was therefore no clear myself do you really have that I find simple slot. Thanks in any case even if there are fewer market with single slot