Quick rule that I used when I started getting ewaste. If it sits in a socket such as an EPROM,ic or CPU it comes off the board. If it is soldered on the board leave it on the board. There are some chips that are soldered on that have value that can come off but you guys should read the stickys at the top of page under the ewaste section. There are two really good ones that should be gone over that identifies board components and computer components that should give you a good base of understanding what to takeoff and what to leave on. Then check out barren realms site because he has some good pictures of most CPU chips and EPROMs that have value.