As the title implies, the Silverstone Strider Platinum ST55F-PT is smaller than you might expect a 550W PSU to be, at just under 6" square.  That this PSU is designed for computers of a small size is reinforced by the fact that there is only a pair of PCIe 6+2 plugs, not a problem for small systems but worth noting if you were planning on adding a second GPU.  [H]ard|OCP's testing shows that the PSU easily meets the 80 Plus Platinum standard and not only was the power delivered impressively stable but the PSU also operated quietly.  It will cost you a small premium but if you need a solid, quiet and small PSU this review is worth checking out.

"SilverStone comes to us today with a Platinum rated PSU that is also billed as having a "Power Density (of) 305W per liter." While this is a bit odd, the messaging seems to be big power in a little footprint. Let's see how this "ultra silent" fully modular PSU stacks up when it comes to serving up big-time power under big-time pressure."

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