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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.
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).
An accelerator card is needed for software that requires 80386 or 80486 hardware, such as Windows 3.11 running in enhanced mode or Windows 95; without this hardware SunPC runs in software-only mode which emulates an 80286. [8] In 1997 a 133 MHz 5x86 AMD SBus co-processor was available. [9]
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]
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.
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]
One of the most famous chipsets produced by SiS was the late 486-age chipset 496/497 which supported PCI bus among older ISA- and VLB-buses.Mainboards using this chipset and equipped with CPUs such as the Intel 80486DX4, AMD 5x86 or Cyrix Cx5x86 processors had performance and compatibility comparable with early Intel Pentium systems in addition to a lower price.
The 64 MB [6] of sound memory on the Sound Blaster X-Fi Fatality Pro sound card is built from two Micron 48LC32M8A2 SDRAM chips. They run at 133 MHz (7.5 ns clock period) and have 8-bit wide data buses. [10] Originally simply known as SDRAM, single data rate SDRAM can accept one command and transfer one word of data per clock cycle.