The Alienware M18x was a gaming laptop introduced in 2011.
- M18x - Introduced in 2011, it is considered a replacement for the original M17x design, but with a bigger chassis, a screen up to 18.4 inches, dual MXM 3.0B GPU support, special keyboard macros, and up to 32 GB of DDR3-1600 MHz RAM. Shipped with Intel Sandy Bridge processors and the option of single or dual AMD Radeon 6870M/6970M/6990M Radeon HD 6000 Series GPU(s), single or dual Nvidia GeForce 500 Series GPU(s). Factory CPU overclocking was also an available option.
- M18x-R2 - 2012 revision of the M18x; originally shipped with Intel Sandy Bridge processors, later shipped with updated with Intel Ivy Bridge Processors, single or dual Nvidia GeForce 600 Series GPU(s), single or dual AMD Radeon HD 7970M Radeon HD 7000 Series GPU(s), up to 32 GB of DDR3-1600 MHz, and optional factory overclock.