What would be better?

[mudum]

a 333 FSB x 10.5 = 3496.5 MHz
DDR2 800 ram underclocked to 667
Ratio is 1:1

OR

a 333 FSB x 11 = 3663 MHz
DDR2 800 ram still the same
ratio is 5:6

this is the best i can do. i can run a 400 MHz x 9 w/ a ratio of 1:1 but it degraded my hardware after 2 weeks and cant even run for over an hour w/out rebooting itself ( probably due to overvolting)

voltages above the first two choices are way below the max safe as i have researched so i need recommendations of which is the better of the two.

both are stable btw. over 10 hours of 3 tests each under prime95 and 10 hours of memtest

 

[redduc900]

The higher clock speed always takes 1st place in performance compared to higher effective DRAM frequencies. And since your 2nd scenario boasts both a higher clock and DRAM frequency, the 2nd choice is apparent regardless of the 5:6 FSB : DRAM ratio.