Hi, I would like to add an editional 1GB of memory to my A64 3400+ Clawhammer C0 Rev. I already have 1GB of OCZ 3500EB Platinum (512x2). Would it be possible for me to just throw in a 1GB DIMM, or will I have to scrap my 512x2 and buy 2 1GB dimms? I have tried adding a 512mb stick to make 1.5GB, but my computer wouldnt even start up.