What makes a good graphics card for Dolphin

[cluthz]

Thanks for the reply!
It's nice to see my aging card still does it's job, and heat it not a concern as I live as far north you can come in the civilized world (Norway).
I also have 2x 140MM and 1x120MM intake on my cabinet and 2x120MM exhaust and a water cooler on my CPU :p

I'm definetly upgrading when the 700 series comes out, because with new console will make system reqs on PC games jump and more and more games with DX11 (Gtx285 is not fully DX11 compliant and f.ex cannot use tessellation, but I run most games in DX11 mode although one or two features are often greyed out.)
AMD is at the moment not an option because I use certain apps that use CUDA acceleration for work.

Anyways for dolphin, have I understood correctly that bandwidth is more important than core speed and amount of cores?
Like a GTX660ti has around 1300 cores and 24 ROPs and my GTX only has 240 Cores, but also 32 ROPs and better bandwidth?

edit: NaturalV clarified this!