CMS 4GB (2X2GB) DDR2 6400 800MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Xw4300, 4300Ct, Xw4600, Xw4600Ct for Server Only - B65 at Amazon.com
HP xw4600 RB428UT Intel Workstation PC - Intel Core 2 Duo E6550 2.33GHz, 2GB DDR2 ECC, 250GB SATA II, SATA DVDRW/RAM, NVIDIA Quadro FX570, Gigabit, Windows Vista Business / XP Pro Downgrade
HP xw4600 upgrading to a Quad (Q9650) - YouTube
8GB KIT (2 x 4GB) for HP-Compaq Workstation Series xw4600 xw4600/CT. DIMM DDR2 ECC Unbuffered PC2-6400E 800MHz Server Ram Memory. Genuine A-Tech Brand.
HP XW4600 Workstation Dual Core 2.33GHz/4GB RAM/Win10 - 4 Monitor Computer PC | eBay