790GX or FX?

[MrAlex]

Well, I want to buy a system with 1 4890.
IS the extra £50 premium worth it? Will my card perform better? Will my CPU perform better? Are there any advantages? OR is it just for CrossFire?

Thanks,
Alex

 

[MrAlex]

Seems that the GX actually beats the FX in some tests!
What would anyone else suggest?
MSI 790GX-GD65 or 790FX-GD70
£50 Premium