Intel Pentium 4-M 2.20 socket: Socket 478

What the Pentium 4-M 2.20 is

The Intel Pentium 4-M 2.20 is a 2.2 GHz single-core mobile processor from September 2002. It runs one NetBurst Northwood core at 2.2 GHz with no Hyper-Threading, so 1 core gives 1 thread. Cache is 512 KB of L2 on a 130 nm process. Power is rated at 35 W in a Socket 478 package with a 400 MT/s front side bus and a 22x multiplier.

The 2.20 P4-M tops the early Pentium 4-M Northwood line with the highest clocks and power in the group. Intel placed it in September 2002. The chip supports MMX, SSE and SSE2 with SpeedStep. Mobile Pentium 4 2.20? No desktop-replacement 2.20 exists at the same clocks, so the P4-M stands alone with battery savings at 35 W.

Top P4-M clocks with SpeedStep suited flagship mainstream notebooks. The 2.2 GHz core with 512 KB gave desktop-like responsiveness with hours of battery life. That is why the 2.20 cost more than slower P4-M parts despite sharing cache.

Socket and motherboard compatibility

The Pentium 4-M 2.20 fits Socket 478 notebooks with P4-M support. It needs a notebook Socket 478 board. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Flagship mainstream notebooks are the natural match. Maker lists decide fit.

Memory, PCIe and cooling

Memory is DDR through the board chipset with notebook slots. The CPU has no controller.

A 400 MT/s bus ties the CPU to the chipset, while graphics hangs off the chipset. No PCIe lanes originate on the die. Cooling is the notebook heat pipe for 35 W.

Upgrade paths

On Socket 478 the 2.20 tops early P4-M Northwood, so same socket upgrades stop here apart from later 2.40 to 2.60 P4-M parts where listed. Pentium M Banias parts on Socket 479 offer lower power paths. The 2.20 removes with the socket mechanism, so swaps need no solder work.