Avago Technologies MegaRAID SCSI 320-0 (520-0 CH) - Manual (Page 18)

1-2 Overview
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The MegaRAID 320-2 Storage Adapter (dual-channel) has one
LSI53C1030 controller chip that controls two SCSI channels. The
Storage Adapter has two VHDCI 68-pin external SCSI connectors
and two HDCI 68-pin internal SCSI connectors.
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The MegaRAID 320-2E (Express) Storage Adapter has one 80332
processor that controls two SCSI channels. The Storage Adapter has
two UHDCI 68-pin external SCSI connectors and two HDCI 68-pin
internal SCSI connectors. Note that the MegaRAID 320-2E is a
PCI-Express controller.
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The MegaRAID 320-2X Storage Adapter (dual-channel) has one
LSI53C1030 controller chip that controls two SCSI channels. The
Storage Adapter has two VHDCI 68-pin external SCSI connectors
and two HDCI 68-pin internal SCSI connectors. Note that the
MegaRAID 320-2X is a PCI-X controller.
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The MegaRAID 320-4X Storage Adapter (quad-channel) has two
LSI53C1030 controller chips that control the four SCSI channels. The
Storage Adapter has four VHDCI 68-pin external SCSI connectors
and two HDCI 68-pin internal SCSI connectors. Note that the
MegaRAID 320-4X is a PCI-X controller.
The MegaRAID 320 Storage Adapters support a low-voltage differential
(LVD) or a single-ended (SE) SCSI bus. With LVD, you can use cables
up to 12 meters long. Throughput on each SCSI channel can be as high
as 320 Mbytes/s.
PCI, PCI-X, and PCI-Express are I/O architectures designed to increase
data transfers without slowing down the central processing unit (CPU).
You can install the MegaRAID 320 PCI and PCI-X Storage Adapters in
PCI-X computer systems with a standard bracket type. With these
adapters in your system, you can connect SCSI devices over a SCSI bus.
PCI-Express goes beyond the PCI specification in that it is intended as
a unifying I/O architecture for various systems: desktops, workstations,
mobile, server, communications, and embedded devices.
Note: For Ultra320 SCSI performance, you must connect only
LVD devices to the bus. Do not connect a high voltage
differential (HVD) device to the controller. Do not mix SE
with LVD devices, or the bus speed will be limited to the
slower SE (Ultra SCSI) SCSI data transfer rates.