Small PSU that packs a punch. Have you ever heard of FSP? It's a brand that isn't particularly renowned for making the best power supplies, but the company actually does just that by making PSUs for the likes of EVGA, Cooler Master, among others. We're big fans of EVGA hardware and so were excited to get hold of FSP's own Dagger Pro SFX PSU.

Small form factor (SFX) power supplies are designed for use in more compact PC cases. The major difference between SFX and full ATX power supplies is size. SFX units usually come in at 125mm x 100mm with a height of just 63.5mm. That's precisely where you'll find the FSP Dagger Pro 850W SFX PSU we have for review today.