Alienware M17x R3, GTX 580M, i7-2720
Specifications

Price comparison
Reviews for the Alienware M17x R3, GTX 580M, i7-2720
Source: Tom's Hardware

Comparison, online available, Very Long, Date: 12/21/2011
Source: Hi-Tech Mail

glossy display, mediocre battery runtime, suited for games
Single Review, online available, Medium, Date: 12/17/2011
Comment
NVIDIA GeForce GTX 580M:
High-end mobile GPU based on a the GF114 chip with all shaders enabled.
Modern games should be playable with these graphics cards at low settings and resolutions. Casual gamers may be happy with these cards.
» Further information can be found in our Comparison of Mobile Graphics Cards and the corresponding Benchmark List.
Intel Core i7: The Intel Core i7 for laptops is based on the LG1156 Core i5/i7 CPU for desktops. The base clock speed of the CPUs is relatively low, but because of a huge Turbo mode, the cores can dynamically overclock to up to 3.2 GHz (920XM). Therefore, the CPU can be as fast as high clocked dual-core CPUs (using single threaded applications) but still offer the advantage of 4 cores. Because of the large TDP of 45 W / 55 W, the CPU is only intended for large laptops.
2720QM: Fast Quad-core processor based on the Sandy Bridge architecture with an integrated graphics card and dual-channel DDR3 memory controller. » Further information can be found in our Comparison of Mobile Processsors.