2 Channel x4PCIe to Ultra320 SCSI, Low Profile. The ATTO ExpressPCI UL5D Low-Profile SCSI host adapter is the industry's first true low-profile PCIe SCSI host adapter, and is the perfect complement to ATTO's existing high-performance SCSI host adapter line. The UL5D LP offers users the same high-performance and feature set that Express PCI SCSI host adapters are renowned for, but due to the low-profile form factor of the UL5D LP, it is also ideal for integration into enclosures where space is at a preimum, such as 1U/2U server chassis. The UL5D LP offers external dual-stacked VHDCI SCSI connectors, allowing direct-attached applications to realize data-transfer rates of up to 640 MB/sec.