Intel Mobile Pentium III 1000 socket: Socket 495

What the Mobile Pentium III 1000 is

The Intel Mobile Pentium III 1000 is a 1000 MHz single-core mobile processor from March 2001. It runs one P6 Coppermine core at 1000 MHz with no turbo, so 1 core gives 1 thread. Cache is 256 KB of full-speed L2 with 32 KB of L1 on a 180 nm process with 28 million transistors. Power is rated at 25 W in a Socket 495 micro-PGA2 package with part numbers SL53S and SL58S on a 100 MHz front side bus with a 10x multiplier at 1.7 V with a 1.35 V battery mode.

SpeedStep drops the chip to 700 MHz at 1.35 V in battery mode, which is why the 1000 suited full-size laptops that need desktop-class bursts on AC with quieter battery operation. Intel launched the Mobile 1000 on March 19, 2001 with the Mobile 900. The chip supports MMX, SSE and SpeedStep with QuickStart and Deep Sleep states.

Gigahertz mobile clocks with a full cache suit Socket 495 full-size laptops with SDRAM and AGP graphics. The micro-PGA2 package allows replacement with the socket lever. That is why the 1000 shipped in performance laptops with docking options. A soldered BGA2 counterpart with the same silicon exists for thinner boards; this page covers the socketed package per the socketed-only rule.

Socket and motherboard compatibility

The 1000 fits Socket 495 full-size laptops with Coppermine support. It needs a 495-pin micro-PGA2 board with a 100 MHz bus and a BIOS that lists Mobile Pentium III 1000. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Full-size SDRAM laptops are the natural match. Boards listing SL53S accept the chip with a 25 W heat pipe assembly. Soldered BGA2 boards cannot accept the pinned package, so the board package type decides.

Memory, PCIe and cooling

Memory is SDRAM through the board chipset, matched to the board slots. The CPU has no memory controller, so the chipset sets the type and speed. Full-size 440BX and 815E boards commonly run PC100 pairs for 100 MHz mobile parts.

A 100 MHz front side 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 laptop heat pipe for the exact chassis, rated for 25 W with SpeedStep fan tables for both performance and battery modes.

Upgrade paths

On the same socket, a move to a Mobile Pentium III 900 such as Intel Mobile Pentium III 900 drops 100 MHz at similar power when a cooler spare matters. The 900 shares the 100 MHz bus and SpeedStep tables, so the pipe often carries over. A Celeron mobile part on the same list cuts cache and is a step down.

A move to Pentium III-M Tualatin needs a board with 512 KB cache support and a BIOS update. The Socket 495 page lists the Coppermine mobile range for planning.