Asus M2N32 WS Professional nForce 590 SLI Motherboard

For business applications which demand SCSI configurations, or professional grade network cards, the Asus M2N32 WS Professional has two PCI-X slots located just below the blue PCI Express x16 slot. Each 3.3V 64 bit PCI -X slot operates at 66 MHz, which means each can support a theoretical maximum bandwidth of 250MB/s. This works out to the same as a PCI Express x1 connection, but obviously the list of supported PCI-X devices is much more substantial than PCI Express x1 devices at this point in time.