[LAD] Is it possible to use two RME cards in sync?

Hi, i have another question to RME experts (hi Florian!). the system i need to build should have 8 AES inputs and 24 AES outputs. For that, i see two basic approaches 1) using two RME AES-32 (*) cards in world-clock synch and 2) using a RME hammerfall with 24 ADAT input/outputs and then several 8ch ADAT<->AES converters such as the Aphex 144 (+), which costs about 400€ each 8ch unit. Option 1 seems to me simpler and cheaper but i ignore if is feasible and reliable: Have anyone had good experiences using two clock-synced RME cards with jack? Are there other options apart from 1 and 2? Thanks a lot! P * http://www.rme-audio.de/en_products_hdsp_aes32.php + http://www.aphex.com/144.htm