Question I see you offer another 200W power supply that is listed as 80-plus efficiency. It is included with the SC502-200B case. Will the PWS-201-1H power supply work for the X7SPA-HF motherboard? Can you tell me whether the PWS-201-1H is a suitable replacement? Would it be quieter? Answer The efficiency of PWS-201-1H on 120VAC is about 84%. It has the same dimension with PWS-202-1H found in SC502-200B chassis, so it will fit. However, PWS-201-1H's internal fan will stop spinning at low loading under 40W. There may be no air circulation to provide the cooling to the processor even when it’s hot. We don't recommend using PWS-201-1H in SC502-200B chassis with X7SPA-HF motherboard. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) M F H 6 FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 10404 Other: - Chassis Compatibility Peripherals: - Power Supply 08/30/10 JC     Print Answer