The 32X contains two Hitachi SH-2 32-bit RISC processors with a clock speed of 23 MHz, which Sega claimed would allow the system to work 40 times faster than a stand-alone Genesis. Its graphics processing unit is capable of producing 32,768 colors and rendering 50,000 polygons per second, which provides a noticeable improvement over the polygon rendering of the Genesis. The 32X also includes 256 kilobytes of random-access memory (RAM), along with 256 kilobytes of video RAM. Sound is supplied through a pulse-width modulation sound source. Input/output is supplied to a television set via a provided A/V cable that supplies composite video and stereo audio, or through an RF modulator. Stereo audio can also be played through headphones via a headphone jack on the attached Genesis. Game library The 32X library consists of 40 games, including six that required both the 32X and Sega CD. Among them were ports of arcade games After Burner, Space Harrier, and Star Wars Arcade, a sidescroller with a hummingbird as a main character in Kolibri, and a 32X-exclusive Sonic the Hedgehog spinoff, Knuckles' Chaotix. Several of the games released for the 32X are enhanced ports of Genesis games, including NFL Quarterback Club and World Series Baseball '95. In a retrospective review of the console, Star Wars Arcade was considered the best game for the 32X by IGN for its cooperative play, soundtrack, and faithful reproduction of the experiences of Star Wars. In a separate review, IGNs Levi Buchanan praised the 32X game Shadow Squadron as superior to Star Wars Arcade. Retro Gamer writer Damien McFerran, however, praised Virtua Fighter as "the jewel in the 32X's crown", and GamesRadar+ named Knuckles' Chaotix as the best game for the system. Next Generation called Virtua Fighter "the colorful wreath on 32X's coffin", reflecting the consensus among contemporary critics that the game was at once arguably the 32X's best release and a clear harbinger of the platform's imminent discontinuation, since it was inferior to the already-released Saturn version of Virtua Fighter Remix, as well as the forthcoming Saturn release of Virtua Fighter 2. In response to fan inquiries, Sega stated that the 32X architecture was not powerful enough to handle a port of Virtua Fighter 2. Despite its 32-bit processing and potential for better graphics and sound than the Genesis, most games did not take advantage of the 32X hardware. Doom for the 32X received near-perfect reviews, but