UPD2:
BIOS F.40, SDD OCZ Vertex 3 60GB - BIOS detected drive when i set up 6GB sata option and W7 starts well, despite extreme II cannot, and visible only when 3GB sata option selected in BIOS…
So yes, again, HP have issue defenetely, until someone will prove otherwise (and frankly speaking i will be happy to see), but FW for extreme II also has some issues.
Maybe for someone my curiosity will save time, so i tried BIOSes F.20, 22, 27, 28, 40, 41, 42 in many variations with options inside BIOS 
- and yes, again, no luck, so will wait …
