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BUS SPEED

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February 22, 2011 7:48:01 PM

WHAT IS THE DIFFERENCE IN MACBOOK 4.1. IT STATES PROCESSOR SPEED OF 2.1GHZ WITH A BUS SPEED OF 800 MGHZ AND THE MEMORY SPEED IS 667MHZ
SHOULD I BUY THE MEMORY UPGRADE AT 667 OR 800 MHZ. I WANT TO UPGRADE FROM 1GB TO 4-6GB.

HELP :o  :o 

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a c 143 à CPUs
February 23, 2011 12:24:13 AM

If you add memory to the existing then it will run all memory at the lowest speed; so it wont matter if you buy the 800, they will just run at 667 if you do.

If you are replacing the existing memory then its best to match the bus speed (800mhz) for optimal performance.
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a b à CPUs
February 23, 2011 1:41:04 AM

Memory will typically 'underclock'. The hitch could be in the SPD register (on the memory module) and how the motherboard handles it (and manual settings if available). The SPD register contains the suggested timings at different speeds. Most modules contain timings for common speeds, so 800 models should be fine at 667. If timings aren't there, its usually possible to manually set them (at least on PC motherboards).

Like popatim says, most systems seem to be most efficient when the memory and system bus are 'in harmony' :) 

Good luck!
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February 23, 2011 2:21:31 PM

Best answer selected by MARIA10463.
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February 23, 2011 2:26:19 PM

2254088,3,523737 said:
If you add memory to the existing then it will run all memory at the lowest speed; so it wont matter if you buy the 800, they will just run at 667 if you do.

If you are replacing the existing memory then its best to match the bus speed (800mhz) for optimal performance.[/quotemsg


all very helpful, thank you all so much this was very very helpful. thanks
jpmucha, popatim, rolli59
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