Workstation Load Tests
Our first set of power supply tests use a high-end workstation configuration, equipped with eight processor cores, 4 GB of memory, a high-end graphics card, and three high-speed hard disks. Our goal was to test the efficiency of these power supplies under different load levels, ranging from sitting idle, maximizing the processors, maximizing the graphics, and the most intensive test, maximizing both processors and graphics at the same time. Wattage/amperage numbers were watched with a hardware power line meter which updates every second. Numbers were taken at the stabilized power level for that specific task.
All of our power supplies had the necessary connectors to handle this configuration, and all handled this high-end configuration without a sweat. Let's see which power supplies handled the load better though.
- 2 x Intel Xeon E5310 (1.6 GHz) Quad Core Processors
- 4 x Kingston DDR2-667 FB-DIMM 1 GB Modules
- 1 x Intel 5000X Chipset Based Motherboard
- 1 x Nvidia GeForce 8800 GTX 768 MB
- 3 x Western Digital Raptor 10,000 RPM Serial ATA Disks
- 1 x Plextor PX-755SA DVD+/-RW Drive
Microsoft Windows Vista Business Edition (64-bit)
- OCZ ProXStream 1000W Power Supply
- Silverstone Strider 850W Power Supply
- Corsair HX620W 620W Power Supply
- Enermax Galaxy 1000W Power Supply
- Enermax Liberty 650W Power Supply
Despite not listing efficiency numbers on their box, the OCZ ProXStream 1000W unit, is indeed, highly efficient. Our high-end workstation configuration ate up about 450W of actual power load throughout our heaviest benchmarks, but throughout each test, the ProXStream shows the lowest actual wattage levels pulled, which is a very positive attribute for OCZ to have. Our tests show the OCZ ProXStream providing similar efficiency levels to that of Corsair's HX620 PSU, which is rated at 80% efficiency. Even an eight-core system with a top of the line graphics card doesn't pull anywhere close to 1000W.