well i don't know if Oblivion doesn't support them, no big deal i guess. I like to run more then 1 program at once though <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />
for example
diablo II
& Gothic II
didn't support dual processors so i had to play those games without any other major program running
you can change your dual processor settings by
(XP)
ctrl + Alt + Delete
under the processes tab
right click on a process and choose set Affinity
i have check boxes for CPU 0 & CPU 1