AMD Athlon 1400 (B) socket: Socket 462

What the Athlon 1400 (B) is

The AMD Athlon 1400 (B) is a 1400 MHz single-core desktop processor from June 2001. It runs one K7 Thunderbird core at 1400 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed L2 on a 180 nm process. Power is rated at 72 W in a Socket 462 package with part number A1400AMS3B on a 200 MT/s front side bus with a 14x multiplier at 1.75 V. The parenthetical B marks the 200 MT/s bus version against the C version on a 266 MT/s bus, giving the bus its own page and slug.

Thunderbird B with a slow bus suited mainstream SDRAM towers that lacked 266 MT/s chipset paths. AMD sold the 1400B at 253 dollars in June 2001 alongside the 1400C at the same clocks on a faster bus. The chip supports MMX and Enhanced 3DNow.

Bus suffixes with matching clocks need careful ordering. The 1400B at 200 MT/s runs cooler on older boards than the 1400C at 266 MT/s, even though frequency and cache match. That is why the suffix stays in the model here.

Socket and motherboard compatibility

The Athlon 1400 (B) fits Socket 462 desktops with a 200 MT/s bus and Thunderbird support. It needs 200 MT/s chipset paths. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

SDRAM towers are the natural match. Boards listing Thunderbird 1400B accept the chip with a 72 W cooler. The 1400C needs 266 MT/s paths instead.

Memory, PCIe and cooling

Memory is SDRAM or DDR through the board chipset, matched to the 200 MT/s bus. The CPU has no controller.

A 200 MT/s 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 72 W heatsink.

Upgrade paths

On Socket 462 the 1400B tops the 200 MT/s Thunderbird line, so same bus upgrades stop here. The 1400C at the same clocks offers a faster bus where listed. Palomino Athlon XP parts offer lower voltage successors. The chip lifts with the lever, so swaps need no solder work.