AMD K6-2 processor families

Released in 1998, the AMD K6-2 microprocessor is an evolutionary update to AMD K6 processor. The K6-2 is based on the same RISC86 core as the K6. This core does not directly execute x86 instructions. Instead, it translates each x86 instruction into one or more simpler fixed-length RISC86 instructions that are stored in scheduler buffer. Each clock cycle the scheduler can issue up to 6 RISC86 instructions to the following 10 executions units: two integer units, two MMX units, load, store, floating-point, branch condition, and 3DNow! ALU multiplier units. The units are independent of each other, and can execute RISC86 instructions concurrently. While the RISC86 instructions can be executed out-of-order by the K6-2 core, the scheduler unit retires instructions in order. Up to 4 RISC86 instructions can be retired per clock cycle.

As already been mentioned, the K6-2 has 10 execution units, i.e. it has 3 more execution units than its predecessor AMD K6. Two extra execution units are used to support 3DNow! - these Single Instruction Multiple Data (SIMD) instructions are somewhat similar to MMX instructions except that 3DNow! works with single-precision floating-point numbers, while MMX works only with integer numbers. Using 3DNow! for floating-point calculations could significantly boost performance of FPU intensive applications that didn't require high floating-point precision (for example, games). Another extra K6-2 execution unit was second MMX ALU unit. Adding second MMX unit to the CPU significantly improved performance of MMX operations.

Many AMD K6-2 processors supported 100 MHz bus speed. Increasing bus speed of K6-2 processors by 50% (from 66 MHz to 100 MHz) while keeping CPU frequency the same resulted in additional 10% performance boost.

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List of K6-2 families

AMD K6-2 533 MHz - AMD-K6-2/533AFX

533 MHz microprocessor was different from all other K6-2 processors in the sense that it required a motherboard with 97 MHz front side bus. Because not all motherboards supported this bus speed an easy solution to this was to underclock the processor and run it at 500 MHz (5 x 100 MHz) or 522 MHz (5.5 x 95 MHz), or overclock it to 550 MHz (5.5 x 100 MHz).

Picture of: AMD K6-2 533 MHz - AMD-K6-2/533AFX

AMD K6-2e 266 MHz - AMD-K6-2E/266AMZ / AMD-K6-2/266AMZ

Embedded version of K6-2. Although the order part number includes "e" in "K6-2e", the actual chip markings do not have "e". For this reason it is impossible to distinguish some embedded processors, like AMD-K6-2E/300AFR, from desktop processors (AMD-K6/300AFR) just using the printing on the chip.

Picture of: AMD K6-2e 266 MHz - AMD-K6-2E/266AMZ / AMD-K6-2/266AMZ

AMD Mobile K6-2 300 MHz - AMD-K6-2/300ANZ-66

K6-2 family had three different sub-generations of mobile processors: original mobile K6-2 CPUs, K6-2-P processors and K6-2+ processors. This specific microprocessor belongs the first sub-generation of mobile K6-2 processors, and shares the same features with all other processors from its sub-generation: low 1.8 core voltage and high (85°C) operating temperature. Lower voltage for this CPU directly translates to power savings - maximum power dissipation for this part is 10 Watt, as opposed to 17 Watt for desktop K6-2 300 MHz CPU.

Picture of: AMD Mobile K6-2 300 MHz - AMD-K6-2/300ANZ-66

AMD Mobile K6-2-P 433 MHz - AMD-K6-2/433ADK

AMD K6-2-P is the second sub-generation of mobile K6-2 microprocessors. These processors have higher frequency, higher core voltage and lower maximum operating temperature than the first sub-generation of mobile K6-2 CPUs. Architecture and micro-architecture of these CPUs is the same: RISC86 core, 0.25 micron manufacturing process, 64 KB level 1 cache, support for 100 MHz Front Side Bus, MMX and 3DNow! instructions set. Mobile AMD K6-2-P CPUs has the same power-saving modes as desktop K6-2 microprocessors. All K6-2-P CPUs were packaged into 321-pin ceramic PGA package.

Picture of: AMD Mobile K6-2-P 433 MHz - AMD-K6-2/433ADK

AMD Mobile K6-2+ 450 MHz - AMD-K6-2+/450 65C 2.2V

This engineering sample K6-2+ 450 MHz is quite unusual. Judging by its voltage (2.2V) and low maximum operating temperature this CPU is not a mobile processor. It can't be embedded K6-2+ either as embedded K6-2 processors have 2.0V or lower core voltage and very high maximum operating temperature. Another thing that distinguishes this processor from other K6-2+ processors is "Copyright 1998" - mobile and embedded K6-2+ have copyright year 1999. This could be an engineering sample of AMD K6-2+ desktop processor, or may be an early sample of mobile K6-2+.

Picture of: AMD Mobile K6-2+ 450 MHz - AMD-K6-2+/450 65C 2.2V

AMD Embedded K6-2E+ 500 MHz - AMD-K6-2+/500ACR

500 MHz
321-pin ceramic staggered PGA

Picture of: AMD Embedded K6-2E+ 500 MHz - AMD-K6-2+/500ACR

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At a glance

32-bit microprocessor
Technology (micron):
0.18, 0.25
Frequency (MHz):
200 - 570
L2 cache size (KB):
0, 128
Socket 7
Super socket 7