Hi guys! So i have an asus m2n mx se plus mobo and i would like to buy a new gpu for it,please don't say i need to buy a new MOBO its outdated or stuff like that ,i have a 550w psu,4gb ddr2 ram and amd athlon 64 x2 5200+ cpu,also which pci express version does this mobo have? My budget is up to 100 euros,will be mostly gaming.I am also fine with purchasing used parts