FSP Twins Pro PC PSU ATX PS2 1+1 Dual Module 700W Certified Efficiency ≥90% Hot-swappable Redundant Digital Computer Power Supply with Guardian Monitor Software (Twins Pro 700)

We have five full sets of these power supplies running 24/7 and they are flawless.

Buying this for a server you care about? Don't.I have had the 700W dual PSU slam off (not one of the modules - the whole thing) while under about 250W of load. When I couldn't get it to slam off reliably, I assigned it to another issue with my test bench and threw this into a production server with 3 Vdevs of 7 HDDs. That's when the real problems started. After running for a few months, random HDDs would start failing for SMART (not unheard of with a bad batch). After sending in those HDDs under RMA - more failed, this time all on the same backplane. That's when I started looking into all the other components (swapping backplanes, cables, HBAs). Drives kept failing. Finally I swapped the PSU out, turns out it was this 700W dual PSU causing massive power issues that were flaring up as SMART failures. I even put the failed HDDs back in and they've been running great for months with no more failures.After reaching out to the manufacturer twice about this and being completely ignored, I have finally remembered to write this review. Not only is the mainboard controlling both "redundant" PSUs prone to failure (the power slam offs), but it isn't even capable of delivering less than half of its wattage rating consistently (over just a few months mind you).Stay away. Redundancy is meaningless at this level of ineffectiveness. Single (Highly Rated) PSU is pbly better.