Intel C80286 4

An early and low clocked 286: 1984 and 4MHz . As far as I know the 4MHz model wasn't used in desktop PC's but did find it's way in a Matrox SX-900 graphics card (see third photo).

This CPU is also housed in the LGA-packaging. A bit more fragile than PGA (with pins on the CPU), yet it looks nice. In the x86 market the LGA-socket disappeared until 2003 when Intel started using it again for the Pentium 4.

An interesting article has been written on CPUShack:

The Matrox SX-900 was a standard MULTIBUS card with support for 640x480x8bit graphics. It supported a fill rate of 20 MPixels/sec which was very impressive in 1984. By comparison, the Nvidia NV1 (STG-2000) released in 1995, was only capable of a 12MPixel/sec fill rate, albeit at a richer color depth.