I wish I had waited and gotten one of these, my P5N-E SLi can't even do 425 FSB.

How big of a difference does 1:1 make on intels?

I currently have to run a divider to reach DDR1000 on my Ballistix. How big of a difference is 500 x 6 1:1 vs 375 x 8 4:3?