Dell AlienWare M17x R3 M18x Series AMD Radeon HD6990M 2GB GDDR5 Laptop Graphics Video Card with Heatsink RDRGR 0RDRGR CN-0RDRGR.AMD GPU Model Number: Radeon HD 6990MDell Part Number: RDRGR 0RDRGR CN-0RDRGRHeatsink Part Number: Y8T9Y 0Y8T9Y CN-0Y8T9YCompatible Part Numbers: 109-C29657-10Compatible Models: Dell Alienware M17x R3 M18x Series