Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe and a power consumption meter. You can read more about our standard testing approach here.
The tests performed are based around six conceivable setups that are out there and progressively load down the PSU up to the power supply's limits or 1000W, whichever comes first. Since our test equipment's limits are higher than that of the Kingwin Power Force 850W power supply, we can test it to the maximum.
The above tests represent typical loads that we have measured from various systems and are meant to give a rough idea of where your computer might fall in line with our tests. Please keep in mind that each system is different and actual loads can vary greatly even with similar hardware.
Let's start by taking a look at the voltages to see how well this unit did during testing. Starting with the 12V rail, we see 3% regulation from start to finish with a total drop of .25V. The 5V rail managed to stay within 2% of specification with a total drop of .14V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 4% of specification with a total voltage drop of .15V.
DC Output quality for the Power Force 850W was excellent and well within specification. During Test 1, we saw 18mV of noise on our scope. When we increased the loads in Test 3, the ripple climbed to 26mV at a little over half load. During Test 5 under a load of 850W, the oscilloscope showed a maximum of 35mv on noise on the 12Vrail.
The Kingwin Power Force 850W is rated for 80 PLUS Bronze efficiency. This means that the power supply must perform at 82%/85%/82% efficiency at 20%/50%/100% loads respectively. As you can see, the Power Force 850W passed on our bench, and wasn't close to failing at any point and was almost on par with an 80 PLUS Silver rating.
It is always refreshing to take a look at a product that isn't on the bleeding or leading edge from time to time. Being surrounded by top tier hardware constantly makes it very easy to lose sight on a large majority of users that don't require and / or can't afford the absolute best. Even better, it takes us back to when we were in the same situation...trying to squeeze the most out of what we had and what we could afford. The Kingwin Power Force 850W is one of these products and proof that Kingwin can offer something to the masses other than top end power supplies.
No, the performance of the Power Force 850W power supply isn't the best that we have ever seen. What it does give us though is a solid performance all the way around while staying well within specifications from start to finish. Sometimes that is what matters most, especially when looking at a lower end product. The PF-850 isn't the cheapest 850W power supply you can get your hands on either, but it isn't too far from it. This gives the Power Force 850W one hell of a value when you stop to think about it, especially considering the features that most cut out of such a unit.