Apps used:

Intel Linpack Benchmark 10.1.0018 64bit Binary
SetFSB 2.8.15 (change FSB on the fly)
CPU-Z (to verify changes to FSB)

Goal:
To show variations in CPU average processing power as a result of CPU and NB GTL Reference voltage and Vtt (AGTL+ Logical High Termination Voltage) fine tuned for a specific Front Side Bus BCLK frequency.
To show the importance GTL Ref and Vtt values have for a small band of FSB BCLK frequencies and where the values go outside their tuned range.

Method:
Start with fine tuned values for 478MHz FSB BCLK and only make changes to FSB BCLK frequency through SetFSB App in Windows. No changes made to GTL Ref or Vtt, and system not rebooted for the duration of all tests so base values are constant.

Results:
To come.

Edit: Argh hard locked the system and now Raid5 array in verify state. Will add more FSB runs once it's done. So probably tomorrow at best. Should have disabled write-back caching before I started.