Sorry.....was out for a while.............I actually already have two sticks of this stuff from Ingram....................yeah, it says cas3, but, I'm running it 2-2-2-6-2 at cas2 in my P4S533 and it hasn't had any problems and is stable...............I tried it in the SR7-8X I got from N.E. but that didn't work so well.............works fine with PC2700, but was flakey as hell with the DDR-400..........That thing is going back though.........I'll wait for the Asus..............😉