With the increased voltage I was able to achieve a 1T command rate and hold those timings up to just 407Mhz while remaining stable in MemTest. That's not much over stock speed, however many DDR2-800 modules won't even run a 1T CMD so this is an accomplishment.
Relaxing the command back to 2T while keeping the other timings as rated, I was able to drop the CPU multiplier down to 12x (in order to pick up the /6 divider) and increase bus speed to 238. This results in a memory speed of 476Mhz or DDR2-952, quite impressive for CAS3!
Finally, relaxing the timings to 5-5-5-15 and dropping the CPU multi again to 10x (with a /5 divider) I was able to raise bus speed all the way to 281, resulting in an incredible memory speed of 562Mhz or DDR2-1124! This is the approximate equivalent of PC2-9000, not bad for a pair of PC2-6400 rated modules, eh?
Now let's compare these various settings in some benchmark tests.