iMac 2.8 Memory Question (Not a Display Post :-)!!

colorspace

macrumors 6502
Original poster
Jul 5, 2005
292
1
I'm a bit baffled, the new iMacs (well at least the 2.8 extreme flavor) list the front-side bus as 800mhz, but yet they seem to come with DDR2-5300 RAM which is 667mhz speed. Am I missing, or have I missed something?

Does the memory bus run at a slower speed than the system bus? Is there anything to be gained by using DDR2-6400 memory which runs at 800mhz?

Would love to know.

Thanks
 

Leon Kowalski

macrumors 6502a
Thank you, CanadaRAM. That guide is very helpful -- but it prompts me to ask one small question:

If I install 2x2GB (identical parts) in a white C2D iMac, does the "dual channel speedup" apply to any/all of the 3.3 GB visible to the CPU?

At current street prices, 4 GB costs only $50-ish more than 3GB. So, if there's any performance benefit, 2x2GB might be an attractive choice. (It already has some attraction in terms of "future-proofing" -- no tellin' what new hardware will appear in the coming year.)

TIA

LK
 

vansouza

macrumors 68000
Mar 28, 2006
1,736
3
West Plains, MO USA Earth
apples and oranges

I'm a bit baffled, the new iMacs (well at least the 2.8 extreme flavor) list the front-side bus as 800mhz, but yet they seem to come with DDR2-5300 RAM which is 667mhz speed. Am I missing, or have I missed something?

Does the memory bus run at a slower speed than the system bus? Is there anything to be gained by using DDR2-6400 memory which runs at 800mhz?

Would love to know.

Thanks
I asked the same question some time ago... they are not related.
 

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