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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 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.
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). Like ...
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]
Auctor [8] / ACC Micro [9] - Maple SoC (Cx486DX4 [10] core at 100 to 133 MHz) Advantech - EVA-X4150 and EVA-X4300 (SoCs with 486SX-compatible processors at 150 MHz and 300 MHz, respectively) [11] Innovasic - pin-compatible 80186/80188 clones [12] Vadem - VG230 and VG330 (SoCs with NEC V30 CPU cores, manufacturing continued by Amphus) [13]
Cyrix released a derivative 486 processor called the 5x86, based on the Cyrix M1 core, which was clocked up to 120 MHz and was an option for 486 Socket 3 motherboards. [ 11 ] [ 12 ] AMD released a 133 MHz Am5x86 upgrade chip, which was essentially an improved 80486 with double the cache and a quad multiplier that also worked with the original ...
Series Model Core Frequency [MHz] Front-side bus [MHz] Year Process [nm] Package size [mm 2] Power [W] L2 cache [K] L1 I/D cache [K] Performance [SPEC2000]
The 63 MHz model was launched in February 1995, and supported 25 MHz bus systems. The much faster 83 MHz version, which supported both 25 (63 MHz effective) and 33 MHz bus systems, launched much later the same year on September, and was very expensive at $299 compared to other upgrade alternatives, such as those based on AMD's 5x86 and Cyrix's ...