Quote Originally Posted by CryptiK View Post
Straps change the chipset timings in relation to the FSB of the CPU being used. The lower the strap the tighter the timings and the better the performance. The strap also defines what memory speeds you have available to choose from.

When you leave the strap on auto, you just choose whatever memory speed you want from the list, and it auto sets the appropriate strap for the speed you chose.
Thanks i'll do my own test some time .