I’ve got as many as six power supply units from Seasonic for this review and they hail from two different worlds. On one hand, there are the expensive top-class ATX units of the X-Gold series with wattage ratings from 560 to 760 watts. And on the other hand, there are compact products for mini-ITX or microATX system cases that are described by the FlexATX, TFX and SFX form-factors and have a wattage rating of no higher than 300 watts. Unfortunately, compact PSUs are not very popular among enthusiasts. I think they do not really deserve such an attitude because you can build a rather advanced gaming configuration even in a tiny cubic case with a 300W power supply. Yet the fact is that such PSUs are mostly limited to office machines built in slim low-profile enclosures. Therefore I will not discuss the products in alphabetic order as I usually do. Instead, I will first talk about the more exciting X-Gold series and their junior cousins will follow later on.