What graphics card should I get? R9 280x Dual SLI or a single R9 290x?

[Cartoonface12]

What card should I get? I will be playing on 1920x1080 res and I will be playing on a 144hz monitor.

 

[firo40]

AMD does crossfire not sli. Get a single 290x as crossfire creates a lot of issues if you don't know what you're doing especially. Which by referring to crossfire as sli I assume you don't