I got the khx3500k2/1g kit on a p4p800 deluxe and when I started testing w/ 2-3-3-7-4 mam at auto and performance at standard I got a system halt in memtest86. No problems in windows, but I am gonna do some more testing. No OC at all just standard 1:1. SPD settings seem to pass all tests fine. I know geil has had plenty of problems as well, but not sure about OCZ. CPUZ shows spd settings as 2.5-3-3-8(I believe), but kingston says it is supposed to run fine at 2-3-3-7-1. Thinking of sending it to kingston for RMA(past initial 30 days... had way too much stuff to test in 30 days especially since I had to rma video card to vendor)....kinda sucks. Supposedly 512mb modules are more finicky anyway. I didn't really plan to overclock anyway, but wanted the option to oc a little and wanted matched pairs. Stability is a much bigger deal to me. You can't enable turbo or mam w/ most of the ram now available so those were kinda a joke. I feel your irritation🙁