Well at the moment thats my setup :
Intel Core 2 Duo E7600 3.07 GHz
ASUSTeK Computer INC. P5QPL-AM Rev X.0x
4 Go DDR2
Radeon HD 5770
And with this i play around 10-12h/day since about 2 years now, i manage to lower the settings in games files as hard as i can but now its over, i cant play anything else than old games, i love old games but i really want to enjoy games like starbound/the witcher/battlefield maybe titanfall soon.
So crossfire/sli is maybe a great thing but for know i think i'll start with this config and maybe in 1 years, after buying pcu cooler/SSD/second screen/upgrade some little things, i will start thinking about crossfire/sli.
Crossfire/sli is for very high budget, i cant afford that for now.
For the motherboard, if i save 20$ from the psu (750w->650w) i can replace the gigabyte with the Fatal1ty one, if it really worth it...
(So many questions, sorry guys, thanks for your patience)