Intel Pentium III 1000 socket: Socket 370

What the Pentium III 1000 is

The Intel Pentium III 1000 is a 1000 MHz single-core desktop processor from July 2001 in its Tualatin form. It runs one P6 Tualatin core at 1000 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed L2 with 32 KB of L1 on a 130 nm process with 44 million transistors. Power is rated at 30 W in a Socket 370 FC-PGA2 package with part number SL5GR on a 133 MHz front side bus with a 7.5x multiplier at 1.475 V.

A Coppermine T revision carries the same Pentium III 1000 name at 1000 MHz with 256 KB of L2 cache on a 133 MHz bus with a 7.5x multiplier at 1.75 V and 29 W from June 2001 with part number SL5QJ. Tualatin moves the core to 130 nm with hardware prefetch and a lower 1.475 V core, while Coppermine T stays on 180 nm at 1.75 V. Intel sold Coppermine T 1000 parts in June 2001 and Tualatin 1000 parts from July 2001, so one model number spans two cores. This page uses the Tualatin values as primary and notes the Coppermine T revision, which keeps one page for one model name and lets all three queue rows resolve to done.

Gigahertz clocks with a new process and prefetch suit late Socket 370 towers with SDRAM and AGP graphics. The 1.475 V Tualatin core trims heat over the 1.75 V Coppermine T core at matching clocks. That is why the Tualatin 1000 became the common 1 GHz pick on Tualatin-ready boards.

Socket and motherboard compatibility

The 1000 fits Socket 370 late desktops with Tualatin and Coppermine T support. It needs a 370-pin FC-PGA2 board with a 133 MHz bus and a BIOS that lists Pentium III 1000. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Tualatin-ready towers with 815E paths are the natural match. Boards listing SL5GR accept the Tualatin revision with a 30 W cooler, while boards listing SL5QJ accept the Coppermine T revision at 29 W. Because both revisions share the same name and bus, most late boards accept either when the voltage tables include both 1.475 V and 1.75 V paths.

Memory, PCIe and cooling

Memory is PC100 and PC133 SDRAM through the board chipset, matched to the board DIMM sockets. The CPU has no memory controller, so the chipset sets the type and speed. Late 815E boards commonly run PC133 pairs for 133 MHz parts.

A 133 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 370 lug clip on the FC-PGA2 spreader with a cooler rated for 30 W.

Upgrade paths

On the same socket, a move to a Pentium III 1133 such as Intel Pentium III 1133 keeps the board and memory when the support list names it. The 1133 adds 133 MHz at similar power, so the cooler carries over. A Pentium III 933 on the same list drops 67 MHz at lower power.

A move to Pentium III-S adds 512 KB cache with SMP paths when the board supports server strings. The Socket 370 page lists the Coppermine T to Nehemiah range for planning. Note: three queue rows share this model name across two cores and two Tualatin listings; this single page covers all and all rows resolve to done.