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From Sonic Retro

The Sega Saturn is powered by two Hitachi SH2, 32-bit RISC processors. These particular SH-2 chips run at 28Mhz (versions were developed which ran as high as 40Mhz), and are capable of processing up to 25 million instructions per second (MIPS) each, for a combined rating of 50 MIPS (MIPS however, is not a true indication of processor performance in many cases). Each SH2 comes with an internal 4K RAM cache in order to speed up processing tasks.

"The SH2 is a small (2 cm square) but fast RISC chip that has been designed primarily to process graphics. Like all RISC processors, it's more streamlined that conventional CISC-based chips and carries out instructions in far fewer clock cycles." — Next Generation