ok, i'm running a XP Mobile 2600+
Right now, i'm at 250 x 10.5
Mem voltage is at 3.3 volts ( for stability, and i have a fan blowing directly on it, so it stays cool )
My VCore is set at 1.9 volts. i SHOULD be able to go lower...i need to try that again here soon. but i'll work on that one later
i'm running OCZ EB P3500 ram. the timings for my ram are : 2.5,3,3,11.
now i am running a 2600+, so don't know how high of speed you will hit, but i think you SHOULD be able to go over 210.
Ok also for the time being, keep your multi set lower. like 10. Then raise the FSB till you arn't stable anymore. then drop it a few, to keep stability. then see if you can raise your Multi by .5 or by 1 or so.
if you don't have a fan blowing on your ram, i do NOT suggest you go above 3 volts. i tried that before. my ram got very hot. so i mounted a fan to blow on it.
also, you may have to make your ram's timings a bit looser.
OH, i also had a problem like this myself. i couldn't get above 220. If you only have that one stick of ram, Try Moving it to another slot.
Before i had the ram in the slot on the far right. i could NOT go above 220'ish. then i moved it to the slot on the far left, now i am at 250. sometimes your ram can be picky about where its placed...but that may just be me, but something that simple raised my fsb by like 30.
good luck.