I have a 512MB PC-133 SDRAM DIMM here that won't work in my Power Mac G4. I will trade this for: 1 512MB PC-100 SDRAM DIMM (or) 2 256MB PC-100 SDRAM DIMM Since it's going into the G4, it needs to be 64-bit wide, non-parity, 3.3v, unbuffered PC-100. Any takers? Gary