You can run your 2.6 at 3250MHz using a 250MHz bus. Now, that requires you to EITHER use a 5:4 CPU:RAM ratio (resulting in PC3200 speed of 200MHz for the RAM), OR use PC4000 at full speed.
You'd get better performance from the system using the memory at full speed, but I doubt your PC3500 will overclock that high. So now you're back to running it asychronous, 200MHz (DDR400), using the 5:4 ratio.
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