Intel Pentium III 1400 socket: Socket 370

What the Pentium III 1400 is

The Intel Pentium III 1400 is a 1400 MHz single-core desktop processor from December 2001. It runs one P6 Tualatin core at 1400 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 31 W in a Socket 370 FC-PGA2 package with part numbers SL64W and SL6C2 on a 133 MHz front side bus with a 10.5x multiplier at 1.5 V.

The top desktop Tualatin clock closes the Socket 370 line, which is why the 1400 carried premium pricing over the 1333 at launch. Intel placed the 1400 in December 2001 as the fastest desktop Tualatin. The chip supports MMX, SSE and hardware prefetch.

Peak Socket 370 clocks with a 31 W envelope suit final-generation Socket 370 towers with SDRAM and AGP 4X cards. The 10.5x half-ratio needs a late BIOS string. That is why the 1400 shipped in flagship Pentium III desktops before the Pentium 4 shift.

Socket and motherboard compatibility

The 1400 fits Socket 370 flagship desktops with late Tualatin support. It needs a 370-pin FC-PGA2 Tualatin-ready board with a 133 MHz bus and a BIOS that lists Pentium III 1400. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Flagship SDRAM towers are the natural match. Boards listing SL64W accept the chip with a 31 W cooler. Mid-2001 Tualatin boards with early BIOS revisions may need an update for the 10.5x string.

Memory, PCIe and cooling

Memory is PC133 SDRAM through the board chipset, matched to the board DIMM sockets. The CPU has no memory controller, so the chipset sets speed and timing. Flagship 815E boards commonly run low-latency PC133 pairs for 1400 MHz parts.

A 133 MHz front side bus ties the CPU to the chipset, while AGP 4X 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 31 W.

Upgrade paths

On the same socket, a move to a Pentium III-S 1400 keeps server cache paths when the board lists S parts, though this 1400 desktop page covers the 256 KB line. A Pentium III 1333 such as Intel Pentium III 1333 drops 67 MHz at 30 W on the same cooler class. A Celeron 1400 such as Intel Celeron 1200 side-steps to budget Tualatin cores at lower clocks.

A move to Pentium 4 needs Socket 423 or Socket 478 with a new board and RDRAM or DDR paths. The Socket 370 page closes the P6 desktop line for planning.