Genuine OEM Dell 220W Watt YD358, R8038, N8368, XM554 Power Supply Unit PSU For Optiplex GX520 and GX620 Small Form Factor Systems SFF Compatible Part Numbers: YD358, R8038, N8368, XM554 Model Numbers: N220P-01, H220P-01, NPS-220BB A Dell Optiplex GX520 GX620 220W SFF Power Supply YD358 H220P-01 HP-L2206F3P Dell Optiplex GX520 GX620 220W SFF Power Supply YD358 H220P-01 HP-L2206F3P