"The Lian Li Silent Force 850W will provide what most PC users want: stable rails up to its rated maximum power. The efficiency, although very good, is borderline as far as 80 Plus certification is concerned, and at one point we get a power factor that dips below the required level of 0.9. The DC level and ripple on the 5V0 are slightly high, but don't let this put you off using the Silent Force 850W. It's a minor problem and will not, in my opinion, affect real world operation of the supply. If efficiency and power factor aren't top of your list of requirements, then this power supply will easily run all dual graphic card configurations with ease, and is on par with other power supplies in its class. The performance of the Lian Li Silent Force 850W power supply, although not perfect, was solid."