If a buy a stick of PC100 SDRAM will it work okay with my beige G3 ? Here's some notes from a knowledgebase article: The Power Macintosh Desktop G3 supports SDRAM DIMMs as defined by the mechanical JEDEC MO-161 specification, and the electrical specification as defined by the JEDEC Standard. Electrically, the Power Macintosh Desktop can support 384MB of memory, using three low profile 128 MB DIMMs. Without low profile 128 MB DIMMs, the computer is limited to three 64 MB DIMMs for a total of 192 MB. ...and the info from the technical manual that came with my beige G3: The main logic board has three expansion slots that accept DIMMs that meet these specifications: * 8,16,32,64,or 128 MB * 3.3 volts (V),unbuffered,64-bit wide,168-pin * 100 MHz/10 nanosecond (ns)cycle time or faster using SDRAM I added some PC100 SDRAM a year or so ago, PC66 SDRAM was too expensive at the time and now it's proving hard to find. I do get occassional Type 10 errors and bus errors with this RAM in my mac , mainly with internet explorer (they were supposed to have fixed those memory leaks in IE 5.1). It's been worse since I added the Audiomedia III card that came with Protools LE but I still only have occassional issues with internet explorer and badly behaved shareware. I'm thinking it IS a hardware issue but only software prone to memory leaks ever crashes, sometimes weeks inbetween it happening. I don't want to spend £41 on 128Mb of PC66 at crucial when I can get 128Mb of generic PC100 RAM anywhere else for about £20, I was thinking seeing as I'm on a tight budget and want to get as much as I can for as little as possible, it seems pointless adding 64Mb when it's only £10 more for 128Mb of PC66 or £10 less for 128Mb of PC100. I did notice that even though the 128Mb DIMM I added to my mac was the same thickness as the 64Mb DIMM it came with, it was taller by a few milimetres aswell, it's not touching the case or anything but it did look a little bit odd next to the smaller 64Mb DIMM.