What do you recommend taking it clear that I want to save as much money as you can as I need to change the Mobo. and there is as much difference between the two? since practically amount to the same thing and I'm confused.
Definitely go for the R9 280X since it offers the performance of a Radeon HD 7970 which is notably faster than a 7950. But if you can, I'd advise you to go for a R9 290 since you can find them under $270 now.