No good news, not good at all actually.
Looks like the cpu has hit its limits.
It runs Prime and Folding fine at 2ghz, 1.75V but it doesn't seem to go any higher.
2050Mhz, 1.85V : Prime95 crashes and BSOD
2100Mhz, 1.95V : same thing.
This sucks badly.

Reminds me a little bit like the P4 C1 steppings. They go pretty high on default voltage but then it's over. Even increasing the voltage doesn't provide a better overclock.

As said, newer weeks and steppings might oc much better than this one.