Need suggestions for best SDRAM for ABIT ST6 mobo with Celeron 1.3. I can go to 512mb (168 pin DIMM) with this board. Manual says memory array is 64 or 72 bit (with or without parity-whatever that means!). I have two sticks of Crucial 128mb 16x64 PC133, is this OK. I would like to go to 512. Would one stick of 512 or two 256's be better? Also what type and brand would be best?