AMD Athlon XP 3000+ (400FSB) socket: Socket 462

What the Athlon XP 3000+ (400FSB) is

The AMD Athlon XP 3000+ (400FSB) is a 2100 MHz single-core desktop processor from May 2003. It runs one K7 Barton core at 2100 MHz with no turbo, so 1 core gives 1 thread. Cache is 512 KB of L2 on a 130 nm process. Power is rated at 68.3 W in a Socket 462 package with part number AXDA3000DKV4E on a 400 MT/s front side bus with a 10.5x multiplier at 1.65 V. The cpu_list 68 W value matches the table 68.3 W after rounding, and the table value is used here.

The parenthetical 400FSB separates this bin from the 333FSB 3000+ at 2167 MHz with the same 512 KB cache and 74.3 W power. Both share the 3000+ rating, yet the 400FSB version trades 67 MHz of clocks for a faster bus at lower power. AMD placed the 400FSB version in May 2003 alongside the 3200+ at 2200 MHz on the same bus. The chip supports MMX, Extended MMX, SSE, 3DNow and Enhanced 3DNow. Suffixes with FSB are part of the model on this site, giving each bus version its own page and slug.

Bus speed with flat cache decides the pick. The 400 MT/s link feeds the 512 KB L2 faster than 333 MT/s parts, which helps office tasks despite slightly lower clocks than the 333FSB sibling. That is why late DDR boards with 400 MT/s chipsets favor the 400FSB bin.

Socket and motherboard compatibility

The 3000+ (400FSB) fits Socket 462 DDR boards with a 400 MT/s bus and Barton support. It needs DDR slots with 400 MT/s chipset paths. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Late DDR towers with 400 MT/s chipsets are the natural match. Boards listing the 400FSB 3000+ accept the chip with a 68.3 W cooler. Older 333 MT/s boards need a full chipset check for 400 MT/s operation.

Memory, PCIe and cooling

Memory is DDR through the board chipset, matched to the 400 MT/s bus for full speed. The CPU has no controller.

A 400 MT/s bus ties the CPU to the chipset, while AGP 8x and PCI hang off the chipset. No PCIe lanes originate on the die. Cooling uses the socket lug clip with a 68.3 W heatsink.

Upgrade paths

On Socket 462 the steps are the Athlon XP 3200+ (400FSB) at 2200 MHz with the same cache and bus. The 3000+ (333FSB) at 2167 MHz offers the same rating on a slower bus at higher power. Beyond Socket 462 a move to Socket 754 needs a new board. The chip lifts with the lever, so swaps need no solder work.