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Helpful answers
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Apr 1, 2014 2:24 AM in response to Plugeeby K Shaffer,All iMac G5 models spec to run with some sort of PC3200 RAM;
none of them list PC2700 as compatible; so that would likely be
a problem as well as slow down the overall data bus speed.
{Earlier G4 iMac (DDR333) USB2.0 models could use PC2700
and in a pinch, use PC3200 (standard 184-pin) in the factory
slot, but it would be seen not as 400MHz, only 333MHz in G4.}
So to mix up these in a G5 iMac would not be wise, or practical.
The RAM chips should also be matching pairs for best use of
the data path threading from through the processor, at speed.
Good luck & happy computing!