First I want to show everyone your XPS 435 MT or T PSU specs, so it would be easier to look for parts
This is a Genuine Dell 475w Power Supply PSU for Studio XPS 435mt and XPS 9000 Full Tower Systems. Compatible Parts F217J, vp-09500073-000.
Features / Specifications:
• 475 Watt Max Output
• 100-240V Input
• Compatible Parts: VP-09500073-000
• Compatible Models: F217J
Connectors:
• 1 x 24pin ATX Motherboard Power (P1)
• 5 x Sata Connectors (P3, P4, P5, P6, P7)
• 1 x 8 Pin Connector (P2)
• 1 x PCI-E Connector (P8)
• 1 x PCI-E + 2Pin Connector (P9, P10)
Based on information above, you can upgrade your PSU if necessary.
However, I found this statement
here
This power supply does not fit in standard ATX chasises, it will only fit in the TOWER version of the Studio XPS 435 and Studio XPS 9000. It will not fit the mini tower form factor
So a little more investigation needed.
Until then you can get any card with about 450 watt minimum requirement!
I use in such instances
MSI Power requirements for graphics cards:
NVIDIA
Geforce GTX 660ti - 24A and a 450W PSU minimum
Geforce GTX 660 - 24A and a 450W PSU minimum
Geforce GTX 650ti Boost - 24A and a 450W PSU minimum
Geforce GTX 650ti - 20A and a 400W PSU minimum
Geforce GTX 650 - 20A and a 400W PSU minimum
GeForce GTX 560 - 24A and a 450W PSU minimum
GeForce GTX 550 Ti - 24A and a 400W PSU minimum
ATI/AMD
Pay attention to the wattage in quote, looks suspicious
Radeon HD 7970 - 30A and a 500W psu minimum
Radeon HD 7950 - 25A and a 500W psu minimum
Radeon HD 7870 - 23A and a 500W psu minimum
Radeon HD 7850 - 21A and a 500W psu minimum
Radeon HD 7790 - 21A and a 500W psu minimum
So based on above I am questioning that 7770 actually need 500W minimum
Radeon HD 7770 - 19A and a 500W psu minimum
Radeon HD 7750 - 16A and a 400W psu minimum
Radeon HD 6850 - 25A and a 450W PSU minimum
Radeon HD 6790 - 25A and a 450W PSU minimum
Radeon HD 6770 - 25A and a 450W PSU minimum
Radeon HD 6670 - 17A and a 400W PSU minimum
Check
this review and decide, do you want just stick 7770 in (I will check if your PSU can support it) and wait, or you may consider upgrading your PSU and get something more serious?