![]() Intel HD and Iris Graphics are divided into generations, and within each generation are divided into 'tiers' of increasing performance, denominated by the 'GTx' label. ![]() Each generation corresponds to the implementation of a Gen graphics microarchitecture with a corresponding GEN instruction set architecture since Gen4. In January 2010, Clarkdale and Arrandale processors with Ironlake graphics were released, and branded as Celeron, Pentium, or Core with HD Graphics. There was only one specification: 12 execution units, up to 43.2 GFLOPS at 900 MHz. It can decode a H264 1080p video at up to 40 fps. In January 2011, the Sandy Bridge processors were released, introducing the "second generation" HD Graphics: Its direct predecessor, the GMA X4500, featured 10 EUs at 800 MHz, but it lacked some capabilities. Sandy Bridge Celeron and Pentium have Intel HD, while Core i3 and above have either HD 2000 or HD 3000. On 24 April 2012, Ivy Bridge was released, introducing the "third generation" of Intel's HD graphics: Model number HD Graphics 20 include hardware video encoding and HD postprocessing effects.
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