AMD Mobile Athlon 64 2800+ socket: Socket 754

What the Mobile Athlon 64 2800+ is

The AMD Mobile Athlon 64 2800+ is a 1.6 GHz standard power mobile processor from January 2004. It runs one K8 core at 1.6 GHz with no turbo, so 1 core gives 1 thread. Cache is 1 MB of L2 with 64 KB of L1 instruction and 64 KB of L1 data cache on a 130 nm process. Power is rated at 62 W in a Socket 754 package with part numbers AMN2800BIX5AP and AMN2800BIX5AR.

Standard power separates this bin from desktop-replacement and low power mobiles with the same model number. Desktop-replacement Clawhammer 2800+ parts run 1.6 GHz with 1 MB at up to 81.5 W for large notebooks on wall power, while low power Odessa 2800+ parts run 1.8 GHz with 512 KB at 35 W for thin bodies. The standard power 2800+ at 1.6 GHz with 1 MB at 62 W targets mainstream notebooks with PowerNow trimming draw at idle. The chip supports MMX, SSE, SSE2, Enhanced 3DNow, NX bit and AMD64 with PowerNow control.

Clock and cache together decide the rating. The 2800+ number does not equal 2.8 GHz, and the 1 MB cache lifts performance over 512 KB mobiles at higher clocks. That is why the 1.6 GHz 2800+ with 1 MB sits above the 1.8 GHz Odessa 2800+ with 512 KB in some tasks despite the lower frequency. Part numbers with AMN mark standard power, AMA marks desktop replacement and AMD marks low power.

Socket and motherboard compatibility

The 2800+ standard power fits Socket 754 notebooks with DDR memory and a BIOS that lists Clawhammer standard power parts. It needs a notebook board with Socket 754 lands and mobile power delivery, not a Socket S1 board with DDR2 slots. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Mainstream notebooks with DDR SO-DIMM slots are the natural match. The maker qualifies the exact AMN part for the heat pipe assembly, since desktop-replacement AMA parts at 81.5 W need larger cooling and low power AMD parts at 35 W need different voltage tables. Swapping across power classes without maker support risks overheating or missing PowerNow states. Forcing the chip into Socket 939 can damage pins.

Memory, PCIe and cooling

Memory is DDR through the on-chip controller in a single channel. Notebook boards fix the SO-DIMM count and ceiling, with the controller setting speed. The 1 MB L2 keeps working data on die, which helps office and media tasks at modest clocks.

An 800 MHz HyperTransport link ties the CPU to the mobile chipset, while graphics and expansion hang off the chipset. No PCIe lanes originate on the processor. Cooling is the notebook heat pipe assembly for a 62 W standard power chassis, with PowerNow lowering voltage and clocks at idle and on battery. Clean vents and fresh paste keep temperatures stable, since notebook coolers cannot be swapped for tower heatsinks.

Upgrade paths

On Socket 754 the standard power steps are the Mobile Athlon 64 3000+ at 1.8 GHz with 1 MB and the 3200+ at 2.0 GHz with 1 MB, both at 62 W for a direct maker qualified swap. Low power Odessa 3000+ parts at 2.0 GHz with 512 KB at 35 W suit thin bodies where power matters more than cache. Beyond Socket 754 a move to Socket S1 needs a new notebook for Turion 64 parts with DDR2 memory. The 2800+ removes with the socket mechanism, so qualified swaps need no solder work.