In order to use that graphics card, you need a new PSU which has 6-2 pins PCI-e power cord. This is not to be confused with the 6-2 pin power cord for powering some motherboards. The Dell uses 4-pins power cord for this.
If you choose to go with the CORSAIR Builder Series CX430 V2, three mounting screws will fit without a problem. The fourth screw will be too short because the PSU power plug interferes with the computer case. This is not a problem. I run mine with three mounting screws.
However, if you insist on 4 screws, the fourth screw must be slightly longer than the rest (1/8" longer) - they look like #6 screws to me, but please verify.
Sorry, cannot follow that advice. I have already ordered a "Modular 450W Quiet 80+ Dual Rail High Efficiency Power Supply" which comes with the Mesh Elite 3450 I have on order.
I ordered the Radeon 7770 with the hope of using it in the Dell while waiting for the Mesh. Dabs.com took a bit longer than I hoped sending it though so i only got it today. Should have the Mesh in about 1 week I think.
So I will wait I think. Too much hassle for a few days of better play. Jon must be patient!
Although if it was possible to pick up a £3 power adaptor from Maplin tomorrow, I could ....
the AMD 7750 does not use an external power cable, it gets all its power from the motherboard. if the PSU can run the 7750, it should be able to run the AMD 7770 even with an adapter. the AMD 7770 uses about 75w at peak. what PC are you getting?
i don't much about that PSU, it looks pretty generic (14a on 12v and 12a on 12v2) but the AMD 7770 barely draws power. it should work just fine plus the PSU comes with a PCI-E power cable. i wouldn't push that PSU past 300w but with your set up, you will well under that number while gaming.