I have Two WD Raptors in RAID 0, accoring to ATTO becnhies, i only have 10mb/s write speed??? I need some HELP!

[OverVolt]

Hey title says most of it.

I have Two WD raptors in RAID 0 via an onboard promise387 controller. The drivers say there not signed by microsoft, my SATA drives show as SCSI drives in RAID, and i only get 10mb/s in write speed according to that benchmark, th read mark is on par, around 99.9mb/s.

Please tell me what i should do? RMA, mobo, HD's, which?

BTW typing on this rig now. Sry bout the long post!