AMD Athlon XP 2800+ socket: Socket 462

What the Athlon XP 2800+ is

The AMD Athlon XP 2800+ is a 2083 MHz single-core desktop processor from February 2003. It runs one K7 Barton core at 2083 MHz with no turbo, so 1 core gives 1 thread. Cache is 512 KB of L2 on a 130 nm process. Power is rated at 68.3 W in a Socket 462 package with part number AXDA2800DKV4D on a 333 MT/s front side bus with a 12.5x multiplier at 1.65 V. The cpu_list 68 W value matches the table 68.3 W after rounding, and the table value is used here.

Barton cache doubles Thoroughbred and Thorton cache at nearby ratings, which is why the 2800+ Barton at 2083 MHz outperforms Thorton 2800+ hypothetical parts with 256 KB despite similar clocks. AMD placed the 2800+ Barton between the 2600+ at 1917 MHz and the 2900+ at 2000 MHz on a 400 MT/s bus in the February 2003 stack. The chip supports MMX, Extended MMX, SSE, 3DNow and Enhanced 3DNow. OEM 2800+ variants at 2133 MHz on a 266 MT/s bus and 2083 MHz low-power bins share the number with different bus tuning, so part numbers separate the retail 333 MT/s version covered here.

Model 10 stepping with 512 KB marks Barton against Thorton Model 10 with 256 KB at the same clocks. Board lists that name Barton explicitly are the safe match, since Thorton-only firmware may miss the larger cache timing.

Socket and motherboard compatibility

The Athlon XP 2800+ Barton fits Socket 462 DDR boards with a 333 MT/s bus and Barton BIOS support. It needs DDR slots with 333 MT/s chipset paths and Model 10 microcode. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Mainstream DDR towers are the natural match. Boards listing Barton 2800+ accept the chip with a 68.3 W cooler. DTR and XP-M 2800+ mobiles need notebook boards instead, even though clocks look close.

Memory, PCIe and cooling

Memory is DDR through the board chipset in a single channel, matched to the 333 MT/s bus. The CPU has no controller.

A 333 MT/s bus ties the CPU to the chipset, while AGP and PCI hang off the chipset. No PCIe lanes originate on the die. Cooling uses the socket lug clip with a 68.3 W heatsink. Fresh paste suits the envelope.

Upgrade paths

On Socket 462 the steps are the Athlon XP 3000+ Barton at 2100 MHz on a 400 MT/s bus and 2167 MHz on a 333 MT/s bus with the same 512 KB cache. The 2600+ Barton at 1917 MHz offers a slower clock where listed. Beyond Socket 462 a move to Socket 754 needs a new board. The 2800+ lifts with the lever, so swaps need no solder work.