AMD manufactured the Am5x86 processor for ordinary PC systems until 1999. It was popular for entry-level desktop systems, appeared in many different notebook models, and also sold separately as an upgrade processor for older 486 systems.

The Cyrix 5x86 design, however, should not be confused with the similarly named AMD Am5x86 which was essentially a clock-quadrupled 486 (not an all-new design like the Cyrix part) but which had broadly similar performance, used the same Socket 3, …

The AMD Am5x86 was one of the fastest, and most universally compatible upgrade paths for users of 486 systems. Introduced in November 1995, the Am5x86 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.

Introduced in November 1995, the AMD 5x86 is a standard 486 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 486-class AMD 5x86 is a 4.0x multiplier (33x4.0=133), but the motherboard should be set to a 2.0x multiplier. The processor will interpret the 2.0x multiplier as 4.0x, and run at its correct speed.

Mar 7, 2011 · It is commonly asked what the fastest socket 3 486 CPU is. Depending on your computing goals, the answer may vary. An appropriately configured IBM/Cyrix 5x86-133 and an AMD X5-160 were the fastest commonly available CPUs for ALU-specific operations and were approximately equivalent to a Pentium 100.

The AMD 5x86 processor is an x86-compatible processor produced in the 1990s by AMD for use in 486-class computer systems. It was one of the fastest, and most universally-compatible upgrade paths for users of 486 systems.

Introduced in November 1995, the AMD 5x86 is a standard 486 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.

Feb 17, 2020 · As processors I have the AMD 5x86-P75 and the Cyrix 5x86-100GP in my stock. After some measurements I decided me for the AMD 5x86-P75 on the Shuttle HOT-433 as reference because: AMD has app. 25% more integer performance than Cyrix.