Seeing loften and TOOl CHILE marks (and my own experiences running both at 186MHz and 191MHz FSB), it almost looks like that's the real sweet spot for some of us who have the i5 core CPU. It seems to take a lot more juice to push the FSB up from there. Maybe we have the same batch number chips ....just FYI, my i5 is batch number L932B759...which I believe stands for made in Malaysia (L) in 2009 (9) in the 32nd week (32) in lot number B759