@Acill:
If you just wanna make sure it works try one of the demos supplied with WarpUP. 'VoxelSpace' for example will give the PPC something to crunch
.
(edit):
Using SCSI-IDE bridges to connect your IDE drives to the CSPPC scsi would indeed result in some respectable performance increase as the data transfer-rates will be much higher and the transfers will be at very low cpu costs as it is DMAed straight into or from memory by the SCSI-controller of the CSPPC.
Happy PPCing!
/Patrik
