Intel Pentium III 1133 socket: Socket 370

What the Pentium III 1133 is

The Intel Pentium III 1133 is an 1133 MHz single-core desktop processor from July 2001 in its Tualatin form. It runs one P6 Tualatin core at 1133 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. Power is rated at 29 W in a Socket 370 FC-PGA2 package with part numbers SL5GQ and SL5LT on a 133 MHz front side bus with an 8.5x multiplier at 1.475 V.

A Coppermine T revision carries the same Pentium III 1133 name at 1133 MHz with 256 KB of L2 cache on a 133 MHz bus with an 8.5x multiplier at 1.75 V and 29 W from June 2001 with part number SL5QK. Both revisions share clocks, cache size and power, differing in process and voltage. Intel sold Coppermine T 1133 parts in June 2001 and Tualatin 1133 parts from July 2001. This page uses the Tualatin values as primary and notes the Coppermine T revision, which keeps one page for one model name and lets both queue rows resolve to done.

Matching power at higher clocks than the 1000 makes the 1133 a steady step up on the same cooler class. The 8.5x ratio is the highest half-ratio in the Coppermine T set carried into Tualatin. That is why the 1133 suited mainstream towers that want a small lift over 1 GHz.

Socket and motherboard compatibility

The 1133 fits Socket 370 mainstream 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 1133. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Mainstream SDRAM towers are the natural match. Boards listing SL5GQ accept the Tualatin revision with a 29 W cooler, while boards listing SL5QK accept the Coppermine T revision at the same power. Voltage tables must include the 1.475 V Tualatin path for the newer revision.

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. Mainstream 815 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 29 W.

Upgrade paths

On the same socket, a move to a Pentium III 1200 such as Intel Pentium III 1200 keeps the board and memory when the support list names it. The 1200 adds 67 MHz at 30 W, so the cooler stays close. A Pentium III 1000 such as Intel Pentium III 1000 drops 133 MHz at similar power.

A move to Pentium III-S 1133S doubles cache to 512 KB with server strings when the board lists S parts. The Socket 370 page lists the Coppermine T to Nehemiah range for planning.