FSP is a company that we have reported on several of their power supplies to date, and today is an interesting one. FSP makes power supplies in various sizes and capacities, including large full ATX sized supplied, including even a liquid-cooled unit with the Hydro TPM. They also offer PSUs such as the Dagger Pro SFX which we recently took a look at. Today we are looking at the new FlexGURU 300W from FSP, and this is a bit more unique of a form factor then most are used to or even aware of.

The FlexGURU is of the Flex ATX form factor, which is a quite small yet long form factor which is used prominently in servers via redundant PSU installations. This similar form factor is what the FlexGURU uses, and while it's not a hot-swappable unit like you may find in many servers, it shares a similar small rectangular form factor. There are some Chassis which can fit Flex ATX, but they are few and far between. Here is a PC Part Picker list which is one of the best I have seen that show Flex ATX PSU compatible chassis. As you can see, most of the chassis is small HTPC/SFF cases, which is what the Flex ATX PSU was ideally made for. There have been Flex ATX PSU's for quite a while, but most users would never notice as they came imbedded in the chassis such as is the case with EVGA's Hadron chassis.