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onboard and pci scsi cards - can't boot unless one bios is disabled

I have a pc with one scsi drive running off the embedded scsi controller (ultra3) on an ASUS CUV4X-DLS motherboard.  I want to boot from the drive on the slower embedded controller and add an LSI Logic 21320RB (Ultra-320) card to run two newer high speed mirrored drives.
I played with the system bios and the bios for both cards, along with the scsi settings on the drives, but could not get the pc to boot from the embedded controller unless the bios on the new card is disabled.  I can then go into Windows Server 2003 and configure the drives as needed, though Hard Disk Management shows the two new scsi drives as 'device type' - unknown (rather than scsi).  Everything seems to work OK.  Drives are mirrored in Windows as D: drive. Device Manager shows both cards and all drives working properly.

I have 2 questions:
SHOULD it be possible to run this configuration with both scsi bios enabled?
Am I losing anything by turning off the bios on the new scsi card, or does it still operate at the Ultra-320 speed and full capabilities? In other words, do I NEED to have the bios enaled for some reason?

1 Solution
The only reason you need the BIOS on the controller card is to boot from it.  If you aren't booting from it, you can disable the BIOS and still benefit from the U320 speeds.
Just to add to Callandor's post, the PCI card needs to have an optional set of "Start Addresses" to play nice with the Onboard SCSI. If it doesn't, then disabling it's BIOS is your only choice.

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