Because I am going to have a kit of redline that can support 3.5V but I'll need active cooling and I think the aquagate can handle the extra stress very easily... am I wrong???
Active cooling == putting airflow over them. Decent thermal paste and proper heatspreaders and/or heatsinks are about the only thing you could really try. Water blocks for DIMMs would be pretty bulky. and certainly couldn't be designed to the same pressure tolderences cpu and gpu blocks are capable of - assuming single stick installed, copper blocks and perspex caps plus fittings, structural integrity, not heavy enough to snap the fingers on the dimm when in a tower.