AMD K6-III+ 475ACZ socket: Super Socket 7

What the K6-III+ 475ACZ is

The AMD K6-III+ 475ACZ is a 475 MHz single-core desktop processor from April 2000. It runs one K6 Sharptooth core at 475 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed on-chip L2 with 64 KB of L1 on a 180 nm process. Power is rated at 12 W in a Super Socket 7 CPGA package on a 100 MHz front side bus.

A 25 MHz step below the 500ACZ at equal power makes the 475ACZ a steady spare for the same coolers, which is why service stocks pair the two strings. AMD sold ACZ Sharptooth parts in April 2000 for late Super Socket 7 boards. The chip supports MMX, 3DNow+ and PowerNow.

Sub-500 MHz clocks with a full cache suit Super Socket 7 value towers with SDRAM and AGP graphics. The 100 MHz bus keeps board timing standard. That is why the 475ACZ shipped in budget office desktops.

Socket and motherboard compatibility

The 475ACZ fits Super Socket 7 value desktops with Sharptooth support. It needs a 321-pin board with a 100 MHz bus and a BIOS that lists K6-III+ parts. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Value SDRAM towers are the natural match. Boards listing K6-III+ 475ACZ accept the chip with a 12 W cooler.

Memory, PCIe and cooling

Memory is EDO DRAM and SDRAM through the board chipset, matched to the board sockets. The CPU has no memory controller. Value SiS 530 boards commonly run PC100 pairs for 475 MHz parts.

A 100 MHz front side bus ties the CPU to the chipset, while AGP and PCI hang off the chipset. No PCIe lanes originate on the die. Cooling uses the socket lug clip with a 12 W cooler.

Upgrade paths

On the same socket, a move to a K6-III+ 500ACZ keeps the board when 25 MHz more matters. A K6-III+ 450ACZ such as AMD K6-III+ 450ACZ drops 25 MHz at equal power. A K6-2+ 475ACZ halves cache to 128 KB at 13 W for a small power cost.

A move to Slot A Athlon needs a new board. The Super Socket 7 page lists the range for planning.