AMD K6: The AMD K6 CPU is the successor to AMD's first Pentium class CPU, the K5. It competes with later Pentiums as well as with the Pentium II.

When AMD's K5 design proved not to be cost competitive with Intel, Cyrix and NexGen competitors, AMD responded by acquiring NexGen and basing the K5 successor CPU on NexGen's design.

The K6 was introduced in mid 1996 as 166 or 200 MHz 2.9 volt CPUs operating in a 263pin socket 7 (321 pin PGA) configuration and drawing 22 watts. All K6s have a 64K cache split into 32K data and 32K instruction. All K6s support MMX instructions. The K6 includes standard Post-Pentium class performance enhancements such as speculative execution, branch history, etc. Performance is generally comparable to Pentiums of the same speed. It slightly outperforms the Intel chips at non-floating point operations and is significantly slower for floating point operations. For the most part the K6-IIs are compatible with Pentiums although one or two products have required patches to run with the AMD CPUs. K6s are not P-rated.

After the initial release, additional CPUs have been released at approximately 33MHz intervals beyond 450MHz in mid 1999. The K6-II Variant includes 3D-Now! instructions and supports 100MHz system Bus operation.

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