I think it's because the PM G5 requires dual channel memory... It's a feature in the iMac that is optional.iGary said:Does the PowerMac G5 require that RAM be installed in pairs, and the iMac G5 does not?
Yeah, I just checked Crucial on their G5 2.0 RAM prices and 4 sticks of 512 runs about $240.00.Lacero said:That's one of the reasons I still have the original 2 128MB RAM Dimms in my PM G5. I'm waiting for the price of 1GB Dimms to drop in price in line with the 512MB versions before I upgrade the RAM.
Yes, the single-processor PM's require pairs of RAM as well.hcuar said:I think the single G5 PM still requires the setup to be dual channel. The iMac doesn't require a dual channel configuration. I've seen the same in PC motherboards... Some require dual channel, some have it as an option.
The speed difference between a SP 1.8 GHz PM and a 1.8 GHz iMac G5 isn't that great. For everyday tasks, the G4 is probably as quick as a G5...this isn't unique to the iMac. Throw in a few processor intensive tasks and the G5's extra horsepower becomes apparent, however.iGary said:I'm just curious why the iMac doesn't, and further to that, why the iMac G5 is so much slower aside form FSB speed...I mean my PM G4 does just as well as my iMac G5 at work (OK, the G5 is a little speedier, but not by much).
The original, Single 1.6 and 1.8 PowerMac G5s used a FSB equal to one half of the processor.hcuar said:Umm... actually the G5 iMac has the same bus speed as the single processor PM. Single processor G5s have a bus speed equal to 1/3 of the processor frequency. Dual processor G5s have a bus speed equal to 1/2 of the processor frequency. I don't think it's a heat issue otherwise the single processor PM would have a faster bus speed. I'm wondering if the single processor G5s use chips that aren't top in their quality rating so they scale back the FSB. Just a thought. Apple could also be putting in an artificial barrier to their product lines to prevent a single processor system from keeping up with their dual counterparts.