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Ram bus speed VS processor speed compatibility question

by creynolds / March 27, 2005 11:22 PM PST

Ok I will try to keep this short.

If your main board only has a 256 FSB can you still use
DDR400 ram or will it not work?

Next question:

If your main board supports a 400mhz FSB but, you are running a 266 CPU bus can you still use DDR400 or will
it also not work in this situation?

I guess the real question is must bus speeds between the processor and the memory match?

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Memory must be faster than the CPU settings.
by R. Proffitt Forum moderator / March 27, 2005 11:31 PM PST

Or else it won't work. Supplying data sooner is usually OK.


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I was reading Einstein's second book and...
by R. Proffitt Forum moderator / March 27, 2005 11:33 PM PST

His analogy of using the train applies here.

If you arrive for the train early, you are successful.

If you arrive late for the train, you are not.


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by Yew / March 28, 2005 12:31 AM PST

There are some exceptions here and there, but generally speaking the RAM will just adjust its speed to the FSB which is generally set to whatever the CPU supports. With the AMD Athlon64, since the FSB controller is actually on the chip itself, the CPU will tend to force a specific bus speed.

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