have a plain dell inspiron 660 full size tower (see picture below). i like to play csgo and would play other games too if i had decent fps. right now i get like 30fps when playing cs and it's really annoying (hasnt stopped me from playing 500 hours though).

hoping someone can help me out with suggestions on what to get. from the little bit i've read, it seems like ill need to buy a new power supply to support a decent graphics card? like it says in title, i dont really know anything about computer parts (mechanically savvy enough to install them derp) budget= $400?
reading around i see people saying things like
MSI Computer Video Graphic Card N760 2GD5/OC ITX
ASUS GTX760-DC2OC-2GD5 G-SYNC Support GeForce GTX 760 2GB 256-Bit GDDR5 PCI E
MSI Radeon R7 260X R7 260X 2GD5 OC 2GB 128-Bit GDDR5 PCI Express 3.0 HDCP Ready CrossFireX Support Video Card
This post was edited by dendo12689 on Oct 29 2015 07:40pm