Hi i just want to know if the iMac 20" with the 2ghz processor would be able to play for example call of duty . If not which mac should i get for gaming. Thanks.
You need a more recent Intel based Mac. Not only did the CPU improve A LOT, but the GPU's did as well. Someting at least 2008 to run that I would recommend. And PPC machines don't support CoD IIRC.
It'll play Call of Duty 2, but not 4. The G5 iMac was somewhat crippled because there was no dual processor/core for it. A Core Duo iMac will be more versatile for gaming than a G5 will.