Are these specs good for gaming?

Hi,
I would like to know if these are good specs for games like FSX, Minecraft and Portal 1/2? Pls send any suggestions. Thanx in advance.
-Windows 7 Ultimate
-Asus M2NPV-VM
-AMD Athlon 64 X2 6000+
-8GB Kingston Dual Channel
-320GB Western Digital HDD
-80GB Seagate HDD
-Thermaltake Black Widow 850W
-Gigabyte GeForce GTX 650 4GB OC Edition
 
Solution
No much, Phenom X4 3GHz is the best you can get on the current board, I'd advise a MoBo and CPU upgrade. Switching to i3/i5 with $60 MoBo will do the trick.