AMD Athlon XP-M 2500+ (35W) socket: Socket 462

What the Athlon XP-M 2500+ (35W) is

The AMD Athlon XP-M 2500+ (35W) is a 1867 MHz mobile processor from March 2003. It runs one K7 Barton core at 1867 MHz with no turbo, so 1 core gives 1 thread. Cache is 512 KB of L2 on a 130 nm process. The package is Socket 462 for efficient notebooks with DDR slots. This page omits a TDP rating because no opened source states a 35 W figure for this exact XP-M bin, while SFF 35 W desktop figures belong to different packages.

The 2500+ (35W) shares clocks and cache with unsuffixed and 72W bins at 1867 MHz, so chassis cooling separates the ratings. All use a 266 MT/s front side bus with a 14x multiplier and PowerNow control. AMD aimed 35 W bins at efficient notebooks with medium heat pipes, between thin low-power designs and large desktop-replacement bodies.

Suffix discipline decides ordering. A notebook qualified for 72 W operation accepts the 35W chip thermally, yet fan tables may misreport without the exact suffix listed. That is why the suffix stays in the model with its own slug.

Socket and motherboard compatibility

The 2500+ (35W) fits Socket 462 efficient notebooks with DDR memory and a BIOS that lists the 35W Barton bin. It needs a notebook Socket 462 board with efficient power delivery. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Efficient DDR notebooks are the natural match. Maker lists decide fit by suffix. Socket 563 boards need a microPGA package instead.

Memory, PCIe and cooling

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

Front side bus operation 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 the exact efficient chassis with PowerNow control.

Upgrade paths

On Socket 462 the 72W bin at the same clocks suits larger bodies. Higher XP-M 2600+ Barton parts offer more clocks where listed. Beyond Socket 462 a move to Socket 754 needs a new notebook. The chip lifts with the lever, so swaps need no solder work.