If it is working properly, easily.
The GX series is CoolerMaster's latest attempt at producing a decent PSU. It has a single 44 amp 12 volt rail.
The 4870 and the 9800GTX+ each need about 10 - 11 amps. If you were to run both cards and the CPU, that would total about 30 amps, leaving plenty for the rest of your system.