WOw, a K6!!! The RAM used is probably still using conventional SDRAM like Alvino said. PC-133 is I remember correctly should be ok. Even if the board supports PC-100, the 133 is backward compatible. It will just step down to the 100 level.
Go their. Select the manufacturer of your computer, gateway, dell, and so on. Then hit next. Then go under, Not sure what you need? And click the link that says cruciail system scanner. It will scan your computer and find out what model it is, and give you a list of what kinds of memory is compatible with your computer. Great for finding out what memory you need.
Bad News! The computer im working on does not have the internet yet. After i work on it they said they would then add a modem. Its just running really really slow.... any more solutions?