AMD K6-2+ 475ACZ socket: Super Socket 7

What the K6-2+ 475ACZ is

The AMD K6-2+ 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 128 KB of full-speed on-chip L2 with 64 KB of L1 on a 180 nm process. Power is rated at 13 W in a Super Socket 7 CPGA package on a 100 MHz front side bus.

Halved L2 against K6-III+ parts at matching clocks trims die cost while PowerNow keeps battery tables, which is why the 475ACZ suited value towers that need little cache. AMD sold K6-2+ ACZ parts in April 2000 for late Super Socket 7 boards. The chip supports MMX, 3DNow+ and PowerNow.

A 475 MHz clock with a smaller cache suits Super Socket 7 value desktops with SDRAM and AGP graphics. The 13 W envelope keeps stock coolers small. That is why the 475ACZ shipped in budget home boxes.

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 K6-2+ parts. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Value SDRAM towers are the natural match. Boards listing K6-2+ 475ACZ accept the chip with a 13 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 MVP4 boards commonly run PC100 pairs.

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 13 W cooler.

Upgrade paths

On the same socket, a move to a K6-2+ 500ACZM keeps the board for 25 MHz more at equal power. A K6-III+ 475ACZ such as AMD K6-III+ 475ACZ doubles cache to 256 KB at 12 W for slightly lower power. A K6-2+ 450ACZ drops 25 MHz.

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