Late to this thread, but I have the exact same model (only with 2GB and a self-installed 500GB hard drive). First thing you should do is put 2GB in it ... that's the max.
It's still going strong for Mail, Word/Powerpoint, DVD ripping, iTunes music management, and writing software, simultaneously.
But, whether it'll be as fast as the PC you sold ... I doubt it. I find the iMac feels more responsive than the 2.26 Pentium-M laptop I've been using at work for the past three years, probably because of the dual core, but for raw power (namely Java compilation), is almost exactly the same speed. It's also compiles at about the same speed as a Dell desktop I use sometimes, a 3.4 GHz Pentium 4. So the iMac would probably rate about 3400+ on the scale AMD uses.
Incidentally, I'm due an upgrade at work ... asked for a Mac, manager has approved it, and I have a decent business case ... will know the response next week.
It's still going strong for Mail, Word/Powerpoint, DVD ripping, iTunes music management, and writing software, simultaneously.
But, whether it'll be as fast as the PC you sold ... I doubt it. I find the iMac feels more responsive than the 2.26 Pentium-M laptop I've been using at work for the past three years, probably because of the dual core, but for raw power (namely Java compilation), is almost exactly the same speed. It's also compiles at about the same speed as a Dell desktop I use sometimes, a 3.4 GHz Pentium 4. So the iMac would probably rate about 3400+ on the scale AMD uses.
Incidentally, I'm due an upgrade at work ... asked for a Mac, manager has approved it, and I have a decent business case ... will know the response next week.