I have the following system. FUJITSU SIEMENS P5GD1-FM 512 Megabytes Installed Memory Slot 'DIMM0' has 256 MB Slot 'DIMM1' is Empty Slot 'DIMM2' has 256 MB Slot 'DIMM3' is Empty Each memory slot can hold DDR PC2700,DDR PC3200 with a maximum of 1GB per slot.* Currently I have 2 x pc3200 at 256mb. It will not support ECC memory but supports dual channeling memory. Now I want to buy 4x 1GB which is the maximum. What type would I buy (it shows things like 184 pins or 240pins?) and where would the best place to get these. Thanks in advance. I never once realised how low my memory was until I'm using the PC an awful lot now. It has a 3.20 processor which would run a whole lot faster with adequete memory.