Can any motherboard run a SCSI harddrive?
Yes, so long as there's a SCSI controller built in or
plugged in (to one of the slots).
I have a Biostar TForce 6100 AM2
.... which doesn't have one built in, so you'll need a slot
and a SCSI card that fits the slot. PCI is more common, PCI
Express you'll have to seek on your own.
with A64 3500+ CPU and would like to run a SCSI harddrive on it.
Ok. Why?
A decent SCSI controller would largely negate the cost
savings if you happened to have the SCSI drive already.
It'll be faster at some things if high RPM, but so would a
WD Raptor, which is natively supported by your board- no
expensive card needed.
Can it do
that out of the box or do i need anything else??
You'll need a cable too, in addition to the PCI % card.