Genuine Dell 9G180 Blower Fan for OptiPlex GX260, GX270, GX60, GX240 and Dimension 4500C, 4600C. For small form factor and small desktop cases, not for towers. Identical fan models JMC/Datech Model DB9733-12HBTL DC 12V 1.35A and NMB Minebea Model BG09038044-VTL DC 12V 1.34A 9G180 Blower Fan Only, Heatsink Not Included Two Interchangeable Fan Manufacturers JMC/Datech Model DB9733-12HBTL DC 12V 1.35A NMB Minebea Model BG09038044-VTL DC 12V 1.34A