“No Rules Power! That makes for a good product tag line, but we all know damn well that power without rules makes for a terrible computer power supply. Does Xigmatek’s NRP 850 watt PSU play inside the rules when it comes to serving up 850 watt?”Here are some more Cases & Cooling reviews from around the web:
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ATX 2.2 is just a suggestion?

The branding “No Rules Power” on the Xigmatek NRP-MC851 850w Power Supply
might make some people nervous, there are a lot of rules that need to be followed if you want to make a PSU that is even slightly reliable. [H]ard|OCP was quick to point that out and unfortunately it was a harbinger of bad news to come. The build is solid, the capacitors used are high quality, as is the technology behind the unit, so it should be a shoe in. That turned out not to be the case.