|VisionTek Killer HD5770 Combo Card|
|Reviews - Featured Reviews: Video Cards|
|Written by Steven Iglesias-Hearst|
|Tuesday, 15 February 2011|
Page 17 of 19
VGA Power Consumption
Life is not as affordable as it used to be, and items such as gasoline, natural gas, and electricity all top the list of resources which have exploded in price over the past few years. Add to this the limit of non-renewable resources compared to current demands, and you can see that the prices are only going to get worse. Planet Earth is needs our help, and needs it badly. With forests becoming barren of vegetation and snow capped poles quickly turning brown, the technology industry has a new attitude towards turning "green". I'll spare you the powerful marketing hype that gets sent from various manufacturers every day, and get right to the point: your computer hasn't been doing much to help save energy... at least up until now.
For power consumption tests, Benchmark Reviews utilizes an 80-Plus Gold rated Corsair HX750w (model: CMPSU-750HX) This power supply unit has been tested to provide over 90% typical efficiency by Ecos Plug Load Solutions. To measure isolated video card power consumption, I used the energenie ENER007 power meter made by Sandal Plc (UK).
A baseline test is taken without a video card installed inside our test computer system, which is allowed to boot into Windows-7 and rest idle at the login screen before power consumption is recorded. Once the baseline reading has been taken, the graphics card is installed and the system is again booted into Windows and left idle at the login screen. Our final loaded power consumption reading is taken with the video card running a stress test using FurMark. Below is a chart with the isolated video card power consumption (not system total) displayed in Watts for each specified test product:
* Results are accurate to within +/- 5W.
A reference Radeon HD5770 is rated at 18W idle and 108W under load, our sample is somewhat different and is expected use slightly more than that. At idle the Killer HD5770 used 43W (162-119) and at full load used 114W (233-119). It seems that the network controller is pulling some extra Watts at idle and making the video card look more power hungry than it might be, at load the Killer HD5770 only uses a further 6W over the reference design.