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I just bought 2 * 512mb sticks of TwinMOS PC3200 DDR memory, because they tested OK at CAS2-2-2-5 @ FSB 208. The trick was getting memory with 5 ns Winbond chips.
Given that your CPU's default FSB is 133 (?), you can easily shoot for an extra 33 MHz on the FSB, which leaves you with an FSB of 166 (?), so PC2700 RAM.
On an NForce2 mobo, you want to run the memory synchronously, so PC 2700 is easiest.
Note: if I'm wrong on the default FSB, add 33MHz to the figures above, and use PC3200 memory. You'll have to check which version of the NB chip you have, because if it's not an A1 or C1, you'll need good cooling on it, and possibly a V mod, to run it at FSB 400.
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