From Intel.com:
Connect. Compute. It’s that simple.
Transform any HDMI monitor or TV into a computer with the Intel® Compute Stick complete with a quad-core Intel® Atom™ processor, Intel® HD Graphics, integrated WiFi and Bluetooth® technologies, 32 GB storage, 2 GB memory, a USB 2.0 port, and a Micro SD card reader. Intel Inside®―endless possibilities outside.
The Intel® Compute Stick. Small, Yet Surprisingly Powerful.
While the Intel® Compute Stick can fit in the palm of your hand, it’s what we fit inside of it that is truly remarkable. A quad-core Intel® Atom™ processor and your choice of operating systems: Windows* 8.1 with Bing* (with a free upgrade to Windows® 10 after release) or Ubuntu* 14.04 LTS.
The Windows version includes 2 GB memory, 32 GB of on-board storage and comes with McAfee® Antivirus Plus for comprehensive protection from Trojans, viruses, spyware and more. The Ubuntu version has 1 GB memory and 8 GB of on-board storage. Both devices come with Wi-Fi* and Bluetooth* for connectivity, a USB port to connect peripherals and a micro SD card slot for additional storage.