I just go a new Areca ARC-1231ML+BBU to replace my current ARC-1210. My current card is having 1 GB DDR2 ECC PC2-4200 533 MHz 2Rx8 from Hynix. I would like to upgrade to 4 GB. Do you know which modules will work for 100% ? I can get KVR667D2Q8P5/4G cheap. It seems to be 4Rx8. Will it work ? Areca told me that only 8 ranked modules will work.