VIA Chipsets slow down PCI cards

SCSI: PCI-Timing

Again, we looked into the PCI traffic with our logic analyzer. The results of the SCSI-RAID are in line with the effects seen with ATA/133 peripherals. The transfers over VIAs PCI bus get interrupted, whereas the Intel motherboards have much longer bursts.

As with the ATA/133 cards the above picture shows, that VIAs PCI bus only transfers blocks of 96 bytes within one burst.

And once again: The Intel chipset transfers 4096 bytes of actual data within one burst and only then asks for a new address.