Since the 60 bay is unique there is a trick to access half the RAM in the 60 bay head units. It has been proven to be very rare, but should you have to replace RAM in the NX3 60 Bay head unit, you must remove the fans and power supplies as in the picture. Support will advise you on which RAM stick to replace.
After the removal of the fans and power supplies, you can access the RAM DIMMs in both banks
