AMD Athlon 1000 (B) socket: Socket 462

What the Athlon 1000 (B) is

The AMD Athlon 1000 (B) is a 1000 MHz single-core desktop processor from June 2000. It runs one K7 Thunderbird B core at 1000 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed on-die L2 with 128 KB of L1 on a 180 nm process with 37 million transistors. Power is rated at 54 W in a Socket A ceramic PGA package with part numbers A1000AMS3B and A1000AMT3B on a 200 MT/s EV6 bus with a 10x multiplier at 1.75 V.

The B suffix marks the 100 MHz bus revision against the C revision at 133 MHz, which is why board lists carry both 1000B and 1000C strings at matching clocks. AMD launched the 1000B on June 5, 2000 with the first Thunderbird wave. The chip supports MMX and Enhanced 3DNow.

Gigahertz clocks on the standard 100 MHz bus suit first Socket A towers with PC100 and PC133 memory. The 10x integer ratio is clean for 200 MT/s boards. That is why the 1000B shipped as the launch gigahertz PGA part.

Socket and motherboard compatibility

The 1000 (B) fits Socket A gigahertz desktops with Thunderbird-B 100 MHz support. It needs a 462-pin board with a 200 MT/s bus and a BIOS that lists Athlon 1000B. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Launch SDRAM towers are the natural match. Boards listing A1000AMS3B accept the chip with a 54 W clip cooler. Boards set only for 133 MHz C-models still run it, but the bus tables must include the 100 MHz path.

Memory, PCIe and cooling

Memory is SDRAM through the board chipset, matched to the board sockets. The CPU has no memory controller. Launch KT133 boards commonly run PC100 and PC133 pairs for 1000B parts.

A 200 MT/s EV6 bus ties the CPU to the chipset on a 100 MHz clock, while AGP and PCI hang off the chipset. No PCIe lanes originate on the die. Cooling uses the Socket 462 lug clip with a 54 W cooler.

Upgrade paths

On the same socket, an Athlon 1000 (C) such as AMD Athlon 1000 (C) keeps the 1000 MHz mark while moving to a 133 MHz bus with a 7.5x multiplier when the board supports it. The C swap lifts memory throughput on 266 MT/s boards. An Athlon 1100 keeps the B line for 100 MHz more.

A Slot A 1000 (BA) cartridge such as AMD Athlon 1000 (BA) is the cartridge twin on older boards. The Socket 462 page lists the B and C range for planning.