Production parts
450 MHz
321-pin ceramic staggered PGA
450 MHz
321-pin ceramic staggered PGA
500 MHz
321-pin ceramic staggered PGA
533 MHz
321-pin ceramic staggered PGA
550 MHz
321-pin ceramic staggered PGA
Samples only
This engineering sample K6-2+ 450 MHz is quite unusual. Judging by its voltage (2.2V) and low maximum operating temperature this CPU is not a mobile processor. It can't be embedded K6-2+ either as embedded K6-2 processors have 2.0V or lower core voltage and very high maximum operating temperature. Another thing that distinguishes this processor from other K6-2+ processors is "Copyright 1998" - mobile and embedded K6-2+ have copyright year 1999. This could be an engineering sample of AMD K6-2+ desktop processor, or may be an early sample of mobile K6-2+.
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Like the previous respondant said, they work in some non-laptop motherboards. Back in 2001, I think, I got myself a K6-III+ 450 MHz for my FIC VA503+. The VA503+ works with K6-2+ and K6-III+ with a special unsupported BIOS.
It is really the most beautiful computer. Cooled by a Kanie Hedgehog 238M and a Nidec Gamma28 fan plus a Zalman Fan Mate, the computer is completely noiseless. You can't hear it. And at 550 MHz it's quite fast, even today.
Do a Google search for: "k6-2+" "K6-III+" motherboards supporting
You'll find a list of supported motherboards on the first link.