○. The following document for the HP xw includes additional guidelines to configure your system. XW Dual Quad Core Ghz is the only model supported. 4GBs RAM. Slot orders are labeled from top (starting with the monitor card) to bottom. (alternative slot – when Slot-5 has IEEE adapter). · Configuration using only HP xw · Configuration using HP xw Slot 5 Mhz PCI-X slot must be de-rated to Mhz operation in BIOS config. . ○.