doom and raja: i'm assuming his pc2700 memory is set to "auto" in his bios, thus it will always run at 333mhz. so when the fsb is pushed up to 400, it and the memory are then running asynchronously and a buffer is implemented and latency goes up.
if he got pc3200, then they could both run at 400mhz in harmony.
doom:, you could try overclocking your pc2700 to pc3200. it's not uncommon. up to you. change your memory setting to "100%" or 1:1 so that it will be synch'd with your fsb. then move your fsb up in 5-10mhz increments. and see if it'll make it to 400 (200 in bios, probably). remember to lower your multiplier so your cpu's core doesn't become the limiter.
raja: interesting, i'll try it.... but do you mean RAS (Row Address Strobe) or RCD (RAS to CAS access)?
[edit] nevermind, i gotcha. well, i changed it and got a ~0.5% increase. the RAS 11 test was done after a fresh restart, so that might explain the small change. but, at the same time, it sure didn't go down like you would think from setting a much higher latency.
do you have some more info on this? i'll try it on my friend's 400fsb a7n8x later.