Need help looking for a new GPU

AgentTran

Honorable
Jan 21, 2014
604
0
11,360
Hey, a friend of mine is doing an upgrade.
His computer specifications are:

AMD Athlon II x4 640
4GB of RAM
HD 5670
400W no-name PSU
Motherboard: http://www.asus.com/Motherboards/M4A88TMUSB3/
He is looking to do an upgrade for his GPU, and his PSU, and possibly even his RAM.
He has a budget of $450 CAD.

I've been looking into some parts, and I could get a R9 280X: http://www.vuugo.com/computer-hardware/computer-parts/video-cards/asus-video-cards-R9280X-DC2T-3GD5.html?tracking=5108053939762

or a GTX 770
http://www.newegg.ca/Product/Product.aspx?Item=N82E16814500301

and then get some 600 - 800W 80+ bronze PSU to go with it, probably corsair, seasonic, XFX, Antec. Whatever can be fit into the budget.

I need some more recommendations though, thanks!

(all parts in Canadian dollars)
 

AgentTran

Honorable
Jan 21, 2014
604
0
11,360


Will the CPU bottleneck either of the GPU's?