In the absence of high end load testing equipment, HTL will conduct a real world test and load the power supply using components that can often be found in a recent gaming system and try to produce a ~80-100% load when under OCCT. Some components might be overclocked to achieve a ~80-100% load. All components are tested inside a case and room temperature was kept at 25C for the duration of the tests. The +12V, +5V and +3.3V will be measured using a digital multimeter and the total system load will be measured in Watts using a digital power meter. For additional heavy gaming system loading scenarios, 3DMark 11 will also be used as a benchmark.

Test System:

System Specifications

  • Processor: Intel Core i7 3770K
  • Motherboard: ASUS P8Z77 WS
  • Heatsink: Noctua NH-D14
  • Thermal Paste: Noctua NT-H1
  • Video Card: NVIDIA GeForce GTX 580, ASUS GeForce GTX 580
  • Memory: Kingston HyperX Red 8GB (2x4GB) DDR3 1600
  • Power Supply: Thermaltake Smart M850
  • Hard Drive: OCZ Agility 4, Seagate 7200.12 1TB HDDs
  • Optical Drive: ASUS BC12-B1ST BD-Combo Drive
  • Operating System: Windows 8 Pro



  • OCCT x 30 minutes for load temperatures
  • 3DMark11
  • Readings taken with motherboard sensors and a digital multimeter


OCCT (515W)

Thermaltake Smart M850W Power Supply 5V Benchmarks

Thermaltake Smart M850W Power Supply 3,3V Benchmarks


Thermaltake Smart M850W Power Supply 12V Benchmarks

Note: OCCT software readings for the +12V are not showing up correctly due to OCCT's incompatibility with the motherboard's voltage sensor. The multi-meter readings below show the physical measurements.


Multimeter Readings

  IDLE (160W)
50~60% Load (510W) 80~100% Load (705W)
+12V 12.10V 12.10V 12.02V
+5V 5.01V 5.00V 4.97V
+3.3V 3.31V 3.34V 3.28V


3DMark 11
  Graphics 1 Graphics 2 Graphics 3 Graphics 4 Physics Combined
+12V 12.10V 12.10V 12.10V 12.10V 12.12V 12.01V
+5V 5.01V 5.01V 5.01V 5.01V 4.99V 4.99V
+3.3V 3.35V 3.35V 3.34V 3.35V 3.35V 3.35V