So you are looking for a compact gaming machine for your favorite games? The Alienware Alpha R2 has you covered. It comes with up to a 6th gen Intel quad-core i7 processor, NVIDIA GTX 960 with 4GB GDDR5, WiFi, 8 GB memory, and 1 TB hard drive.
The machine also has multiple USB 3.0, HDMI, and other useful ports. It measures (H) x 7.87” (W) x 7.87” (D). Costs under $950.