Hi friends, Sorry for the bandwidth. I have an oscilloscope that I am upgrading (LeCroy WaveRunner 6100) which has a PC within it and runs window 2000. I have not played with the inside of a PC since the days of the 486 so I am quite rusty here, guys! First step is to upgrade the ram. It currently has 1 RAM module with 512MB. I would like to put as much ram into this baby as possible. Probably the max would be 2G as two 1G modules. Here is a picture of the label on the one module... http://w2hx.com/x/LeCroy/WR6K/0304171610.jpg I've been reading up as much as I could on this. It appears to be DDR RAM (PC-2100) Probably DDR-266. I read the following on Wikipedia... https://en.wikipedia.org/wiki/DDR_SDRAM Size of the chip is measured in megabits<https://en.wikipedia.org/wiki/Megabits>. Most motherboards recognize only 1 GB modules if they contain 64M×8 chips (low density). If 128M×4 (high density) 1 GB modules are used, they most likely will not work. The JEDEC<https://en.wikipedia.org/wiki/JEDEC> standard allows 128M×4 only for slower buffered/registered modules designed specifically for some servers, but some generic manufacturers do not comply.[7]<https://en.wikipedia.org/wiki/DDR_SDRAM#cite_note-7>[verification needed<https://en.wikipedia.org/wiki/Wikipedia:Verifiability>] It seems 2GB might be achievable as long as I use 64MB x 8 low density? So friends, can someone help me find a product on newegg, or amazon for two modules that might work for me? The next steps for this scope will be to replace the slow IDE hard drive with a PATA SSD hard drive and then upgrade the CPU (1.70 MHz Celeron) with whatever I can upgrade it to. Much appreciated! Eugene W2HX