Hi,
just like to say I'm having similar problems, so Stephen seems not to be the only one. Will wait to see what fix Kevin comes up with for Stephen.
These are my problems:
1. once out of 5 'cold' starts or so it won't boot, giving a series of 3 beeps. Resetting and things are fine again.
2. using xmp settings give me other problems, like decreased memory size. My XMP settings are exactly the same as Stephens screenshot btw. Rebooting and selecting automatic 1333mhz setting again doesn't give me these problems. Everything is fine again.
I'm am also using a Corsair Vengance kit, CML32GX3M4A1600C10 4x8gb, with my DZ87KLT-75K board. My bios version currently is the 0445 official update.
Greetings,
S.