Hi, this case has two rows of 89 hp  rails, it has a power supply that gives 3.5 a x 12v, 1a x -12v and 4 a x 5v (so good even for digital modules and for metasonix), it works perfectly with all eurorack modules and is absolutely noiseless. it has a power busboard with 20 sockets . to turn it on you need to connect it with a comune pc power cord and switch it on. if you have further questions please ask me without problems.