E6550 overclcocking queries

hi
im tryingto over clock my e6550 asrock g31m-gs mobo, 4gb pc-5300 memory. issue i have is it wont overclock the normal way, what i mean, is if i try to raise fsb, then it locks, but if i say ajust pcie to 110 i can get to 2.62mhz but no more, what am i doing wrong, i did try 400fsb x 7 and ram to ddr 800, but locked up. i cant get no higher than 2.6mhz and dont want to ajust pcie any more as dont know effect, i only upped pcie as its next to fsb on asrock overclock utility
havent ajusted any voltages as not sure, stock fan/heatsink btw
any help guys

oops update just upped pcie to 121 and fsb to 401, 2.8mhz . hope this is ok?

Whaaa? you have no idea of what PCI-E frequency does so you decided to go ahead and change it?
Why didn't you alittle research before changing settings in the BIOS.. Set the PCI-E frequency back to 100

I believe your stock FSB is 333 (7 x 333 = 2.33Ghz), going straight up to 400 was to big a jump, try 340 to start off with, and don't set your 666Mhz RAM to run at 800Mhz... not all RAM will be able to overclock that much.