SilverStone Zeus ST75ZF 750 Watt Power Supply Review
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Introduction and Features
SilverStone Technology, Inc. has just introduced a new flagship power supply to their Zeus high output line. Along with providing even more power, the ST75ZF 750W power supply unit (PSU) claims to deliver higher efficiency and quieter operation than previous Zeus models — wow!
SilverStone is based in Taiwan with a sales office in California. They specialize in designing low acoustic and high performance PC and HTPC enclosures, power supplies and other accessories for the PC enthusiast market.
SilverStone Zeus ST75ZF 750W PSU Key Features:
- 750 watt continuous power output
- ATX12V v2.2 and EPS12V support
- Quad +12V outputs (up to 60A combined +12V)
- NVIDIA SLI and ATI CrossFire Ready
- High-Efficiency (>80%)
- Active PFC with Universal AC line input
- 3-Year warranty
In addition to the power supply the box also includes a power cord, mounting screws, wire ties, a detailed manual and three adapter cables.
The Zeus 750W 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 +/- 0.05%)
- WattsUp? Pro — digital wattmeter (Accuracy 3% of full scale)
- Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy +/- 3%)
- Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC
- FLUKE 52-II digital thermometer (Accuracy +/- 0.3ÂºC/0.5ÂºF)
- Extech Model 407736 digital sound level meter (Accuracy +/- 1.5 dB)
- AccuLab V1-10kg digital balance (Accuracy +/- 1g)
- Homemade PSU load tester — selectable loads (up to 470W)
- Seasonic PSU load tester (up to 137W)
Establishing a controlled load is critical to testing and evaluating a PC power supply. I built my own power supply load tester using 13 wire-wound, ceramic resistors of various sizes. This unit can now place up to a 470 watt combined load onto the power supply being tested and includes independent +12V1 and +12V2 loads. Different combinations of resistors can be switched in or out to select various loads. In addition to my own load tester, I also used a load tester manufactured by Seasonic (75W and 137W loads).
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