The V Mod worked perfectly on EVGA A1 680i. Droop has disappeared, just brushed over the points a few times, powered on, checked droop using speedfan. Brushed across a few more times - hey presto droop gone.

To get 400+ FSB sable I use the following volts
FSB 1.4
SPP 1.55
SPP-MCP 1.55
MCP 1.6

Using these settings I get my G0 Q6600 stable @3.8ghz using only 1.475v
Benchmarks here we come.