[n4f13]

FSX run between 15-30 fps
My spec :
Intel core i5 750 OC 3.80Ghz
MSI P55-CD53
8Go DDR3 1333 Mhz Ram
XFX ATI HD 5850 1Go

like you see my spec and fsx still run slower not so much but slower.
the big important thing you can buy it for fsx is the CPU
FSX NEED HIGH FREQUENCY of the CPU like 3.80,4.0 or 4.20 GHZ to run faster