DDR RAM for P4 2.4?

[crazyray]

I'm a poor man, still running a dual PIII with SDRAM.

For my son's birthday I'm assembling a P4 system using a 2.4 CPU on an MSI 645E Max-U mobo. The CPU indicates it will run either a 400 or 533 FSB, and the mobo supposedly will handle either one. Apparently, I don't understand DDR specs.

My understanding is: DDR266= PC2100
DDR333= PC2700
DDR400= PC3200

Am I right? If I want to run this thing with a 533 FSB, what kinda RAM do I need? And do I need PC3200 for a 400 FSB?

Thanks to the Techimo community for helpin' those of us who are puter-challenged.

[Droppyale]

I'm running a p4 2.4ghz with an MSI MB 533hz with PC2700.
(overclocked a bit)

works perfect.

but you could use PC3200 also.

[crazyray]

I appreciate the response. I have no intention of overclocking (stock Intel HSF), but I sure would like to improve my understanding of DDR RAM and how it relates to the FSB of the processor...

Any other comments?

[poopeyhed2]

You have the memory specs right on.

As for pairing the P4's with the memory, the PC2100 should go with the 400 MHz FSB and the PC2700 goes with the 533 MHz FSB and the PC3200 should go with the 800 MHz FSB.

They all correlate because of the bandwith. Running in sycrhonous mode, where you'd get the best performance. The newer and more overclockable mobos can do the multiplier between the CPU and the memory so that you can set how fast they'd perform. Like 1:2 for hte memory, it'd run 1/2 of the CPU's FSB.

Edit: Or something like that with the multiplier, I'm not too familar as I have no experience on it, and that's what I have learned from reading reviews.