Intel Pentium III 1000B socket: Slot 1

What the Pentium III 1000B is

The Intel Pentium III 1000B is a 1000 MHz single-core desktop processor from March 2000. It runs one P6 Coppermine core at 1000 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed on-die L2 with 32 KB of L1 on a 180 nm process with 28 million transistors. Power is rated at 33 W in a Slot 1 SECC2 cartridge with part numbers SL4BR and SL4KL on a 100 MHz front side bus with a 10x multiplier at 1.7 V.

The B suffix marks the 133 MHz bus revision, though this Slot 1 1000B runs a 100 MHz bus with a 10x ratio while Socket 370 EB twins use 133 MHz, which is why board lists separate the slot and socket strings. Intel launched the Slot 1 1000B on March 8, 2000. The chip supports MMX and SSE with Advanced Transfer Cache.

Gigahertz cartridge clocks close the Slot 1 line, which is why the 1000B carried flagship pricing. The SECC2 package needs the retention cage. That is why the 1000B shipped in final Slot 1 performance towers.

Socket and motherboard compatibility

The 1000B fits Slot 1 late desktops with Coppermine support. It needs a 242-lead slot board with a 100 MHz bus and a BIOS that lists Pentium III 1000B. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Late SDRAM towers with 440BX paths are the natural match. Boards listing SL4BR accept the cartridge with a 33 W cooler. Socket 370 boards take PGA chips only.

Memory, PCIe and cooling

Memory is SDRAM through the board chipset, matched to the board DIMM sockets. The cartridge has no memory controller. Late BX boards commonly run PC100 pairs for 1000B cartridges.

A 100 MHz front side bus ties the cartridge to the chipset, while AGP and PCI hang off the chipset. No PCIe lanes originate on the cartridge. Cooling uses SECC cartridge heatsinks locked to the retention cage.

Upgrade paths

On the same slot, a Coppermine 933 cartridge on the same support list drops 67 MHz at lower power. A Pentium III 1000 such as Intel Pentium III 1000 is the Socket 370 PGA twin at matching clocks on a new board.

A move to Tualatin needs a Socket 370 board. The Slot 1 page lists the cartridge range for planning.