I found another pesky little bug in 1204. When resuming from S3 sleep my vcore is set ~0.015 lower than it previously was (which in turn causes instability). This only happens when overclocking as far as I can tell. CPU is question is i7-965. Tried with 143 x 28 and 145 x 29 multipliers. After reverting to 1104 the problem disappears.

All settings have been applied manually direct through the BIOS.