mine does the same crap dude and its so frustrating.

i do not believe the mobo is communication properly with the SPD of the ram.

the SPD dictates a whole slow of data to be the defaults for the ram and i am not so sure the mobo is using them. its using its own settings.

i just spent the last FOUR FRACKING HOURS trying to make this system boot and run, without erros my 2 kits of gskill 6400 HZ.

it still isnt error free but atleast i am in windows.

it was even getting errors at default 800mhz 5-5-5-15 1.9v, 2.0v, 2.1v

whats VERY VERY strange is that one run thru memtest might show a sh|tload of errors, reboot do it again and you might have only a fraciton of those errors.

test 5 is REALLY wierd. test 5 is the normal test ot use because its so intensive on the ram.
1 run will give zero errors thru 20+ runs,, the next reboot i do it again and i am getting thousands of errors.
power off, go in and fvck with the bios and i get no errors, reboot and i get all sorts of errors again.

personally, i haven't the foggiest idea wtf is going on but i am about to rip the mobo out..

you have to remember this is 2 very good clocking kits of ram that have never failed me in terms of high overclock and NO errors. i can usually runn 1100+ 5-5-5-15 2.2v or 2.3v depending on which kit and they run like a champ, now this board is totally screwed up and it wont even run stock mhz without getting errors... then no errors, then more errors, then no errors.
arrggg!!!!!