NOTE: Aurora R13 and XPS 8950 Required TWO VRM Heatsink to Working. VR HeatSink is the components that convert your 12V to the voltage your CPU needs, Processor heat sinks are essential to keep your system running at maximum efficiency and minimizing costly downtime and repairs. Manufacturer Part Number(s): X30MK, 0X30MK, CN-0X30MK, ASSY,HTSNK,VR,D12 Reference list of compatible with De1l Desktop Models: - Aur0ra R13 - XPS 8950 - Precision 3660 Tower What's in the Box 2x Voltage Regulator Heatsink (NOTE: R13 and XPS 8950 Required TWO VRM to working.)