Intel Pentium 4 2.2 socket: Socket 478

What the Pentium 4 2.2 is

The Intel Pentium 4 2.2 is a 2.2 GHz single-core desktop processor from February 2002. It runs one NetBurst Northwood core at 2.2 GHz with no Hyper-Threading on this rating, so 1 core gives 1 thread. Cache is 512 KB of L2 on a 130 nm process. Power is rated at 55.1 W in a Socket 478 package with part numbers SL5YS and SL66S on a 400 MT/s front side bus with a 22x multiplier at 1.36 V to 1.435 V. The cpu_list January 2002 date and 92 W value differ from the table February 2002 and 55.1 W, and the table values are used here.

The 2.2 Northwood replaces Willamette 2.0 parts with a die shrink from 217 square mm to 146 square mm and doubled cache from 256 KB to 512 KB, cutting power while lifting performance at higher clocks. Intel sold it at 562 dollars in February 2002. The chip supports MMX, SSE and SSE2.

Low power with a large cache made the 2.2 a cool office tower chip. The 55.1 W envelope needs only a small Socket 478 cooler. That is why the 2.2 remained common in corporate desktops after faster Northwood parts launched.

Socket and motherboard compatibility

The Pentium 4 2.2 fits Socket 478 desktops with a 400 MT/s bus and Northwood support. It needs a 478-pin board. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Corporate DDR towers are the natural match. Intel 845 boards accept the chip with a 55.1 W cooler.

Memory, PCIe and cooling

Memory is DDR through the board chipset. The board sets speed and capacity.

A 400 MT/s bus ties the CPU to the chipset, while AGP handles graphics. No PCIe lanes originate on the die. Cooling uses the Socket 478 bracket with a 55.1 W heatsink.

Upgrade paths

On Socket 478 the steps are Pentium 4 2.40 and 2.53 Northwood parts. Celeron 2.20? No Celeron at the same 2.2 GHz exists with 128 KB as a value alternative. Beyond Socket 478 a move to LGA 775 needs a new board. The 2.2 lifts with the lever, so swaps need no solder work.