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The Am5x86 (also known as the 5x86-133, Am5x86, X5-133, and sold under various 3rd-party labels such as the Kingston Technology "Turbochip" [4]) is an Enhanced Am486 processor with an internally set multiplier of 4, allowing it to run at 133 MHz on systems without official support for clock-multiplied DX2 or DX4 486 processors.
The MediaGX was first available in speeds of 120 and 133 MHz with pricing of $79 and $99. [2] The 150 MHz version of the MedixGX was available by June of 1997. This version of the chip would be used in the Presario 2120. The 150 MHz chip would cost $99 each in bulk quantities with the 133 and 120 MHz costing $88 and $60. [3]
In 1995, with its Pentium clone not yet ready to ship, Cyrix repeated its own history and released the Cyrix Cx5x86 (M1sc), which plugged into a 3.3V 486 socket, ran at 80, 100, 120, or 133 MHz, and yielded performance comparable to that of a Pentium running at 75 MHz. Cyrix 5x86 (M1sc) was a cost-reduced version of the flagship 6x86 (M1).
The official Cyrix 5x86 website boasted about several features of the chip that were disabled by default in the final versions. The most controversial of these features was the branch prediction feature, which was enabled in the benchmarks results on the company website when comparing the chip to Intel's Pentium processor.
The 6x86 is socket-compatible with the Intel P54C Pentium, and was offered in six performance levels: PR 90+, PR 120+, PR 133+, PR 150+, PR 166+ and PR 200+. These performance levels do not map to the clock speed of the chip itself (for example, a PR 133+ ran at 110 MHz, a PR 166+ ran at 133 MHz, etc.). [46]
Intel beat AMD to market by nearly four years, but AMD priced its 40 MHz 486 at or below Intel's price for a 33 MHz chip, offering about 20% better performance for the same price. While competing 486 chips, such as those from Cyrix , benchmarked lower than the equivalent Intel chip, AMD's 486 matched Intel's performance on a clock-for-clock basis.