I just got a CPU from some guy, A64 Venice core, it's got pins C1 and D1 modified to disconnect them from the socket. These are assigned as L0_REF0 and L0_REF1, "Compensation Resistor to VLDT" and "Compensation Resistor to VSS"
The question is, why anyone would want to disconnect them. I have to assume it's for an overclocking mod, so if anyone knows please help!
More abouthelp figure
I don't know what those two pins are for but you could be interested in looking at This Thread on Xtremesystems.