Intel Mobile Pentium 4 HT 2.80 socket: Socket 478

What the Mobile Pentium 4 HT 2.80 is

The Intel Mobile Pentium 4 HT 2.80 is a 2.8 GHz single-core mobile processor with Hyper-Threading from September 2003. It runs one NetBurst Northwood core at 2.8 GHz with no turbo, so 1 core gives 2 threads. Cache is 512 KB of L2 on a 130 nm process. Power is rated at 68.4 W in a Socket 478 package. The cpu_list 68 W value matches the table 68.4 W after rounding, and the table value is used here.

The 2.80 HT uses a 533 MT/s front side bus with a 21x multiplier. Intel sold it at 294 dollars in September 2003. The chip supports MMX, SSE and SSE2 with Hyper-Threading. Mobile Pentium 4 2.80 parts at the same clocks offer a single thread without Hyper-Threading, so threads separate the bins.

Balanced mobile power with threads suited large notebooks for office multitasking. The 68.4 W envelope needs a desktop-replacement heat pipe with wall power. That is why HT mobiles cost more than non-HT mobiles at the same frequency.

Socket and motherboard compatibility

The Mobile HT 2.80 fits Socket 478 desktop-replacement notebooks with mobile HT support. It needs a notebook Socket 478 board. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Large DDR notebooks are the natural match. Maker lists decide fit by threads.

Memory, PCIe and cooling

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

A 533 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 68.4 W operation.

Upgrade paths

On Socket 478 the steps are the Mobile HT 3.06 and 3.20 parts. Non-HT 2.80 mobiles offer the same clocks without threads. Pentium M parts on Socket 479 offer thin paths. The 2.80 removes with the socket mechanism, so swaps need no solder work.