heisenko

Hi everybody My name is George and i would like to upgrade my video card to 8970m, m290x, etc. i know you have a lot of experience about it and that's why im looking for your support to select the best option to my project, which option do you recomend?: 1.- The Cross fire option but without i have to do the PSU MOD 2.- The best single card option support for my m17x R2 (as yours) 3.- Can you share me some examples from ebay I'm new in this topic i've read a lot here and in other forums ando also a see the scene has advance on this.