Good morning again Mr Transam,
The pcmv run of mine that you are looking at above was 6xAcardR0, ich10R, 4k stripe, wbc enabled
Areca and 5870 do not like to coexist on this mobo for some odd reason.
Not sure if it is a P55 limitation or just this mobo implementation of it, bios?, ...
Might be insufficient pcie bandwidth.