The Rosewill CAPSTONE-550M is an outstanding power supply that passed our tests with flying colors. All voltages were within 3% of their nominal values all the time, ripple and noise levels were extremely low, and efficiency was always high.
The original CAPSTONE-550 is sold today for USD 80, while the new version with a modular cabling system is sold for USD 100. We think that paying USD 20 for the modular cabling o
ption is too much for a low-wattage power supply that doesn’t have a lot of cables. In our opinion, the original CAPSTONE-550 provides a better price/performance ratio than the new CAPSTONE-550M. Still, the new unit is an excellent power supply that won’t disappoint.