Thanks,
the test-results at barefeats are rather puzzeling. I want to use the internal raid for video, with a separate, single bootdrive. Backup will be done on other external drives. The machine will be used mainly for SD work. So I guess raid 0 will be ok. If we plan to do any serious HD we will investigate in a G Speed or a caldigit.
Bummer, that a Mac pro with 4 internal drive bays has no raid-ability at that price point.
CU