yes u r right. I only tried 1066 and 1200 so far....as mentioned p5q deluxe

Issue 1 -> @400 strap 2.02v in bios for ram on 1200hz will boot into windows and showing 1333hz
Issue 1 -> @Auto strap 2.22v in bios for ram on 1203hz will boot into windows and showing 1203hz

Issue 1 has better ram performace read from everest than issue 2.