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AMD K6-III
  AMD-K6-III/350AFK
  AMD-K6-III/400AHX
  AMD-K6-III/450AHX
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The AMD K6-III Processor
The K6-III was the last and fastest of all Socket 7 processors. It achieved the distinction of being the fastest x86 processor on the market on release, and remained highly competitive for a considerable time afterwards.
 
In conception, the design was simple: it was a K6-2 with an additional L2 cache. The original K6-2 had a 64 KB primary cache and a much larger amount of motherboard-mounted cache (usually 512 KB or 1 MB but varying depending on the choice of main board). In contrast the competing Intel parts used 32 KB of L1 cache and either 128 KB of full-speed secondary cache integrated into the CPU itself (Celeron) or 512 KB of half-speed cache mounted on a processor daughter board (Pentium II, Pentium III). The K6-III, however, used both methods: it had 64 KB primary cache, a massive 256 KB on-chip, full-speed secondary cache (similar to the Celeron's but twice the size), and the variable size motherboard mounted cache on the Socket 7 main board became a tertiary level.
 
In execution, however, the design was not simple: with 21.4 million transistors, it was a very large chip to manufacture with early 1999 technology, and the K6 core design did not scale well past 500 MHz. Nevertheless, the K6-III 400 sold well, and the K6-III 450 was clearly the fastest x86 chip on the market on introduction, comfortably outperforming AMD's K6-2s and Intel's Pentium IIs.

References:  AMD K6-III Tech Docs
AMD-K6-III/350AFK
AMD-K6-III/350AFK Top Side
AMD-K6-III/350AFK
2.2V CORE/3.3V I/O
B 9916APE W
(m) (c) 1998 AMD
Win95Logo
MALAY
AMD-K6-III/350AFK Back Side
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Core Frequency:350 MHz
Board Frequency:100 MHz
Clock Multiplier:3.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:21,400,000
Circuit Size:0.25
Core / I/O Voltage:2.2 / 3.3 V
Introduced:February 22, 1999
Manufactured:week 16/1999
Made in:Malaysia
L1 Cache:32+32 KB
L2 Cache:256 KB
CPU Code:Sharptooth
Package Type:Ceramic
PGA-321
Heat Spreader
Socket: 7
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AMD-K6-III/400AHX
AMD-K6-III/400AHX Top Side
AMD-K6-III/400AHX
2.4V CORE/3.3V I/O
B 9927DPCW
(m) (c) 1998 AMD
Win95Logo
MALAY
AMD-K6-III/400AHX Back Side
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Core Frequency:400 MHz
Board Frequency:100 MHz
Clock Multiplier:4.0
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:21,400,000
Circuit Size:0.25
Core / I/O Voltage:2.2 / 3.3 V
Introduced:February 22, 1999
Manufactured:week 27/1999
Made in:Malaysia
L1 Cache:32+32 KB
L2 Cache:256 KB
CPU Code:Sharptooth
Package Type:Ceramic
PGA-321
Heat Spreader
Socket: 7
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AMD-K6-III/450AHX
AMD-K6-III/450AHX Top Side
AMD-K6-III/450AHX
2.4V CORE/3.3V I/O
B 9929FPCW
(m) (c) 1998 AMD
Win95Logo
MALAY
AMD-K6-III/450AHX Back Side
add comment
Core Frequency:450 MHz
Board Frequency:100 MHz
Clock Multiplier:4.5
Data bus (ext.):64 Bit
Address bus:32 Bit
Transistors:21,400,000
Circuit Size:0.25
Core / I/O Voltage:2.2 / 3.3 V
Introduced:February 22, 1999
Manufactured:week 29/1999
Made in:Malaysia
L1 Cache:32+32 KB
L2 Cache:256 KB
CPU Code:Sharptooth
Package Type:Ceramic
PGA-321
Heat Spreader
Socket: 7
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