just for interest sake for those who care...
i have an e6600 that walled at 500fsb 6x multi on DFI P965-S
performed the pinmod, in post#1, to 333fsb and now the wall is broken...6x multi can now clock up to 520 fsb and my ram may be the limit there...

so for those of you who have 333fsb capable boards and can't figure out why your fsb is mysteriously stuck at some point near 450-500fsb this pinmod may help.