What is Performance Level?

[Thrmionicshaman]

Low performance is better. But as you increase the FSB u'll have to raise it

From my testing

400FSB = PL 7
450FSB = PL 8
500FSB = PL 9

Some mobos can run lower PL then others.

Indeed.
It seems with my DFI p35 T2R I can do PL5 up to about 422 FSB with 1.37- 1.41V and PL8 with all the phases pulled in to 7 with 1.5V for 500 FSB. Gigabyte and especially P45 NB do not usually afford such a luxury, At least, that is what I have read, but P45 can clock FSB higher at the expense of higher PL.
Divide the PL by the FSB to get your acess time in nanoseconds. Same thing for CAS/Actual Mem MHz-not DDR MHz.
@Method and anyone really-Here is a cool link explaining some of the technical stuff about PL, there are some cool equations too
Hope you enjoy
"Why we were wrong about the Intel X48"
http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=1
and more- http://www.tweakers.fr/timings.html
and moreagain-http://www.thetechrepository.com/showthread.php?t=160
http://www.thetechrepository.com/showthread.php?t=195

@RPGWizard nice bandwidth BTW!