What about 64-bit?

ripfrankwhite

macrumors regular
Original poster
Dec 13, 2005
184
5
As I understand it, the G5 iMac is truly 64-bit, and the new Merom iMacs only have a 64-bit CPU, but the chipset is only 32-bit. What difference will the 64-bit Santa Rosa chipset make? What are the advantages? Thanks a lot.
 

robbieduncan

Moderator emeritus
Jul 24, 2002
24,638
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Harrogate
treblah said:
Seeing as how the iMac only supports 3GB of RAM, does it really matter? :rolleyes:
This is probably being caused by the chipset. Santa Roso would allow more than 4Gb of RAM (the 3Gb is that you need some memory space left to memory-map peripherals into).
 

treblah

macrumors 65816
Oct 28, 2003
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robbieduncan said:
This is probably being caused by the chipset. Santa Roso would allow more than 4Gb of RAM (the 3Gb is that you need some memory space left to memory-map peripherals into).
http://www.anandtech.com/showdoc.aspx?i=2715&p=2

Merom will be given a faster FSB on the Santa Rosa platform (most likely 800MHz or 1066MHz), but will otherwise remain unchanged from what launches later this year.
I can't find enough info about Santa Rosa or, more specifically, Crestline to make a informed call on this one. But even if Crestline supports >4GB, and Apple doesn't intentionally cripple it, I still doubt there will be more than 3 RAM slots in the iMac, MB(P), mini and 2GB sticks will still cost a pretty penny. So the 64-bitness is a mute point to everyone but marketers and those who think "64 is bigger than 32! It must be better!!!11".