I'm looking to upgrade my old Dell Studio XPS 435mt, I like the CPU (i7 920) in it so not really thinking of building a brand new rig yet. My main reason for upgrading is for moderate gaming like single player RPGs on mid to high settings, on a 3440x1440 ultrawide that I have ordered already. It seems like the r9 390 has good support for 1440 resolution so I'm thinking of getting that, but it seems I would have to upgrade my PSU and also my case to hold the large card. My motherboard also only has PCI Express 2.0, so I don't know if that would be a problem.
If this is doable, can someone verify that these parts would all work together:
[Motherboard] (http://www.findlaptopdriver.com/dell