The PowerMac should be quicker, however there isn't too much in it. The bus is the difference. The iMac bus is between 533 and 700MHz depending which you have. A 1.8 PowerMac runs a 900MHz bus.
The graphics cards are the other main difference. The original iMac G5 had an nVidia 5200 and the ones with ambient light sensors have Radeon 9600s. The PowerMac would have shipped with either a 5200, a 9600Pro, a 9800Pro or a 6800 Ultra (If you're really lucky). Of course you have the option to change it if you wish.
There won't be too much in it really, they run the same RAM and same chip. The PowerMac has the advantage of expandability, the iMac has a screen included. Thats what you should base your choice on.
A PM G5 would be faster than your iMac. The 1.6 really isnt worth moving to unless you need the expansion of it. Its slow and the last G4s were faster than it. My advice would be to stick with your iMac until you can afford something that is considerably faster, like a dual G5 or Mac Pro. You could always get a new iMac too.
i have found a power mac G5 1.6 for 299 i might buy it but is going to beas fast my iMac g5 1.8 ghz coz all i am atfer is the dual monitor feature and so i can upgrade the graphics and do some video editing on it .
That is a good deal for a PM G5. Still, if you can find a MDD G4 I would go with that. It is faster and much more expandable than a G5. If you go with the G5 I would go with the 6800 ultra. It will be better for vid edits and is in general the best card you can get for that model.
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