cooling units for the processors came factory installed. The R2 used dual channel memory and had dedicated graphics card options including AMD Radeon HD 5000 Series, Nvidia GeForce 400 Series and Nvidia GeForce 500 Series. Power supply options were 525W or 875W. Both SLI and CrossFireX were supported. The Aurora R3 (Discontinued) - This was the third revision of the Aurora. It was based on Intel's P67 platform (LGA 1155 Socket). Processors included Core i5 and i7 processors only (second generation quad core Sandy Bridge). In order of model number: i5-2300, i5-2400, i5-2500, i5-2500K, i7-2600, i7-2600K. Sealed liquid cooling units for the processors came factory installed. The R3 used dual channel memory and had dedicated graphics card options including AMD Radeon HD 5000 Series and Radeon HD 5000 Series as well as Nvidia GeForce 400 Series and Nvidia GeForce 500 Series. Power supply options were 525W and 875W. Both SLI and CrossFireX were supported. The Aurora R4 (Discontinued) - This is the fourth revision of the Aurora. It is based on Intel's X79 platform (LGA 2011 socket). This model shares identical hardware with the Aurora ALX (R4). Processors include Core i7 processors only (third generation quad core and hexacore Sandy Bridge Extreme). In order of model number: i7-3820, i7-3930K (six core) and i7-3960X (six core). Sealed liquid cooling units for the processors came factory installed. The R4 is the first to use quad channel memory and has Dedicated graphics card options including AMD Radeon HD 6000 series and Radeon HD 7000 series as well as Nvidia GeForce 500 Series. Nvidia GeForce 600 Series were added later in the year. Power supply options were 525W and 875W. Both SLI and CrossFireX were supported. The optional ALX chassis offered thermal controlled venting, tool-less/wireless hard drive bays, internal theater lighting and an extra array of external LEDs. Coupled with the TactX keyboard and mouse it offered up to 25 billion lighting color combinations. The Aurora R5 (Discontinued) - The fifth revision of the Aurora was announced on June 13, 2016 and was available to purchase June 14, 2016. The updated Aurora was given a facelift and ergonomic handle on the top of the case and is the first of its kind to offer tool-less upgrades to graphics cards, hard drives, and memory. The Aurora was being marketed as being VR ready out of the box, even so far as being HTC Vive Optimized