should I go with a GTX 770 or 780 TI? Rig in description

plrbear1028

Reputable
Jun 27, 2014
460
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4,790
i7-3770 @ 3.40 GHz
Nvidia Geforce GT 640
8 GB of Ram
resolution: 1920 x 1080p

it's a Dell XPS 8500 too.. what upgrades? I know I should get at least another PSU and also... how the heck do you get the side panel off it? I'm having a horrible time getting it off and I bought torque screws, however it doesn't seem to work at all. :(