The memory and the hard drive may be useful, but there's some unknowns as eddaweaver suggested.
What do you want to do with the system at the end of the day? See, the technology has moved on a bit and K6-II systems are OK for only general-purpose stuff like typing letters, web browsing and cd-burning. For games, well even with a fast grafix cards new games struggle.
If you want a better, deal, buy a cheap Duron setup ideally new. If you want to transfer the memory, you may be able to use it in an older Socket A board that can accept this older type of RAM.
The K6-II uses SDRAM. New boards use DDR SDRAM.
. AMD CPU Data: http://www.tomshardware.com/20.../amd...ult/page23.html
. Belarc Advisor: http://www.belarc.com/free_download.html
. GPU Comparison for Laptops: <a href="http://www.notebookche