Dell Dimension 9100 9200 XPS 420 430 Precision 380 390 T3400 Heatsink & Shroud (XP850 K8977) Genuine Dell CPU Heatsink with Shroud For the Dimension 9100, 9150, 9200 and XPS 400, 410, 420 430 Also fits Precision Workstation 380 and 390