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Check the RAM bus size on G5 Macs
Authored by: Cameroon on Oct 11, '04 02:40:49PM

Regarding the two posts above: As long as you have paired sticks of RAM (i.e. even numbers of the same sized sticks of RAM), the architecture will be able to use a 128-bit datapath on the bus.

For instance, if you only have one stick of 512 RAM in your machine, you will end up with a 64 bit datapath. If you put a second 512 stick in, you will get a 128 bit datapath.

This isn't something that some people receive in their machines and others do not, it's a consequence of using standard RAM (which I guess only has a 64-bit wide path). But if you interleave 2 sticks of 64-bit wide RAM on a system that supports 128-bit wide reads, then you can use those 2 sticks to get a 128-bit path rather than 64.

Fortunately they designed the system such that it can accept non-paired configurations, just at a performance penalty.



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Check the RAM bus size on G5 Macs
Authored by: Cameroon on Oct 11, '04 02:43:31PM

(I just love responding to my own post :-p)

I think I misinterpreted what the first two posters were saying, so my apologies.



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