There are a whole lot of different types of compact power supplies: SFX12V (in multiple versions varying in size and component layout), TFX12V, CFX12V, LFX12V, FlexATX... It would be next to impossible to collect all of them in one review and hardly necessary too since they are not interchangeable, so our today’s tests will be concerned with only two varieties. TFX12V PSUs are a popular choice for compact computers whereas FlexATX PSUs can be found in 1U servers, besides desktop PCs.
It must be noted that the PSUs we are about to test cannot be compared directly. Seasonic’s products are newer and certified for the 80 PLUS Gold standard whereas the Enhance ones are older and only comply with the 80 PLUS Bronze or even just the basic 80 PLUS standard.
Anyway, we don't often have to deal with such form-factors but they are important indeed considering the growing popularity of compact computers. That’s why the difference in class doesn’t prevent us from discussing them all in a single review.
The following article offers a detailed description of our testing methodology and equipment and a brief explanation of what the specified and tested parameters of power supplies mean: X-bit Labs Presents: Power Supply Units Testing Methodology. If you feel overwhelmed with the numbers and terms this review abounds in, refer to the Methodology.
You can also go to our Cases/PSU section to check out reviews of all other PSU models we have tested in our labs.
We will mark the actual power consumption of three system configurations (discussed in our article PC Power Consumption: How Many Watts Do We Need?) in the cross-load diagrams. This will help you see if the tested PSU can meet the requirements of a real-life PC.