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Because the 5x86 is the equal of a Pentium 75 MHz processor in benchmarks, AMD later marketed the chip as "Am5x86-P75". [8] Sales of the Am5x86 were an important source of revenue for AMD at a time when lengthy delays in bringing the AMD K5 to production were threatening the company's profitability. [9] [10]
AMD Am486DX 40 MHz AMD Am486DX2 66MHz AMD Am5x86-P75 AMD Am486 DX2-66 die shot AMD Enhanced Am486 DX4-120 die shot AMD Élan SC450 in Nokia 9000 Communicator. The Am486 is a 80486-class family of computer processors that was produced by AMD in the 1990s.
Am5x86 350 Am5x86: X5-133 1 No 133 33 FSB 16 Socket 3 Socket 2 Socket 1 168 pin discrete: K5 500, 350 AMD K5: SSA/5, 5k86 1 No 75–133 50, 60, 66 FSB 8+16 0 Socket 5 Socket 7: discrete: K6 350, 250 AMD K6: Model 6, Littlefoot 1 No 166–300 50, 60, 66 FSB 32+32 0 Socket 7: discrete: MMX + MMX: 250, 180 AMD K6-2: Chomper, Chomper Extended ...
[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 486DX motherboards. [11] Am5x86 was the first processor to use AMD's performance rating and was marketed as Am5x86-P75, with claims that it was equivalent to the Pentium 75 ...
The designation "P75" was added to the chip to denote this. [3]: 3 Later that year, Cyrix also adopted the PR system for its 6x86 [1] and 6x86MX line of processors. [citation needed] These processors were faster than Pentiums of the same speed in some benchmarks, so Cyrix gave them a Performance Rating faster than their clock speed. [3]
Historically, AMD's CPU families were given a "K-number" (which originally stood for Kryptonite, [1] an allusion to the Superman comic book character's fatal weakness) starting with their first internal x86 CPU design, the K5, to represent generational changes.
Model Number Frequency L2-Cache FSB [a] Multiplier Voltage TDP Release Date Release Price Order Part Number Duron 900: 900 MHz: 64 KB: 200 MT/s: 9x: 1.75 V: 42.7 W: May 14, 2001
The P75 was a released in 1990 upgraded version of P70 model, and is noted as being the first portable computer using a 486 CPU to be available for sale in the United States. It had a briefcase-shaped design and ran off A/C power only, as was common with high performance portable computers at the time.
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