Good GPUs for a 305 watt Dell PSU?

Solution
As expected with the PSU 12v x 12A = 144w so you definitely need a new PSU as that won't power a GPU and the rest of the system. Will try and look up that model and see if I can spot any restrictions
2 problems. Dell PSU's are cheap nasty things and it's highly likely the 12v rail does not come close to 305w, I'd be surprised if it was over 150w. What amps does it say it can deliver on the 12v rail? It should be on a sticker on the PSU.

Your other problem is you need to look up you exact model Dell. Dell have been known to block GPU upgrades by making the BIOS only allow certain specific models of gpu.

Dell really don't want you upgrading there machine, they would rather you bought a whole new PC
 

WhatAreYouLookingAt

Commendable
Apr 30, 2016
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12 amps and model www.findlaptopdriver.com/dell-0gm819-mainboard-specifications/
 

WhatAreYouLookingAt

Commendable
Apr 30, 2016
104
0
1,680

Wow thanks man.
 

WhatAreYouLookingAt

Commendable
Apr 30, 2016
104
0
1,680

Try PC-DELL-755-T-C2D-20-4-160-DVW-10H201605042