Well, the case is well ventilated, it has 2x120mm fans, one in the front and one in the back, enough to cycle hot air. And about the Radeon, I enabled CCC's overclock function and increased the video card's fan speed and now it's running at 50C; the processor temperatures dropped a little bit:

Full Load:
CPU: 55C.
Core #0: 58C.
Core #1: 62C.

Temperatures were taken with the AC on and it's on all the time. The AC reports 68F room temperature (20C).
I ran prime95 long test for 4 hours and had no errors or warnings so I guess the OC settings are rock stable atm, still, I might run it again from 8 to 12 hours.
And I'm in Venezuela atm.

Thanks for replying.

TAM.