SilverStone Zeus ST85ZF 850W Power Supply Review
Introduction and Features
SilverStone Technology, Inc. recently added a new 850W power supply to their Zeus high output line. The ST85ZF is very similar to the Zeus 750W power supply but the 850W now includes four hard-wired 6-pin PCI-e connectors in addition to an extra 100 watts of output capacity. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
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SilverStone Zeus ST85ZF 850W PSU Key Features:
- 850 watt continuous power output
- ATX12V v2.2 and EPS12V support
- Quad +12V outputs (up to 70A combined +12V)
- Quad PCI-e 6-pin connectors
- Industrial grade components
- Efficiency greater than 80%
- Active PFC with Universal AC line input
- 3-Year warranty
In addition to the power supply the box also includes a heavy duty power cord, mounting screws, wire ties, 8-pin to 4-pin +12V ATX adapter, and printed manual. If you are interested in seeing what really makes this power supply tick, a very detailed, 13-page electrical specifications document is available on the SilverStone website.
The Zeus 850W power supply was evaluated on both features and performance. A full range of equipment was used to test the power supply under controlled load conditions. In addition to measuring the power going in and coming out I looked at voltage regulation, electrical noise (AC ripple), sound level, efficiency and cost. Here is a list of the equipment used during testing.
- FLUKE 87-III True RMS digital multimeter (Accuracy Â±0.05%)
- Extech 380803 Power Analyzer (Accuracy Â±0.5% of full scale)
V-650F 60 MHz dual trace oscilloscope (Accuracy Â±3%) Hitachi
- Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC
- FLUKE 52-II digital thermometer (Accuracy Â±0.3ÂºC/0.5ÂºF)
- Extech Model 407736 digital sound level meter (Accuracy Â±1.5 dB)
- AccuLab V1-10kg digital balance (Accuracy Â±1g)
- Homemade PSU load tester — selectable loads (up to 470W)
- (2) CSI3710A Programmable DC load (up to 150W each)
- (2) CSI3711A Programmable DC load (up to 300W each)
Establishing a controlled load is critical to testing and evaluating a PC power supply. In addition to my own home-made load tester, I'm now using four programmable DC loads for greater flexibility and accuracy. This new combination can place up 1,400 watt load on the unit being tested.
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