Installation of any of the AMD Radeon cards is really easy. Once the card is seated into the PC make sue you hook up the monitor and of course any external power connectors like 6 and/or 8-pin PEG power connectors. Preferably get yourself a power supply that has these PCIe PEG connectors natively (converting them from a Molex Peripheral connector anno 2010 we feel is a no-go).
Once done we boot into Windows, install the latest ATI Catalyst drivers and after a reboot all should be working. No further configuration is required or needed unless you like to tweak settings, for which you can open the Catalyst Control Center.
Let's have a look at how much power draw we measure with this graphics card installed.
The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.
Note: As of lately, there has been a lot of discussion using FurMark as a stress test to measure power load. Furmark is so malicious on the GPU that it does not represent an objective power draw compared to really hefty gaming. If we take a very-harsh-on-the-GPU gaming title, then measure power consumption and then compare the very same with Furmark, the power consumption can be 50 to 100W higher on a high-end graphics card solely because of FurMark.
After long deliberation we decided to move away from Furmark and are now using a game-like application which stresses the GPU 100% yet is much more representable of power consumption and heat levels coming from the GPU. We however are not disclosing what application that is as we do not want AMD/ATI/NVIDIA to 'optimize & monitor' our stress test whatsoever, for our objective reasons of course.
Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz. Next to that, we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.
We'll be calculating the GPU power consumption here, not the total PC power consumption.
Measured power consumption
System in IDLE = 166W
System Wattage with GPU in FULL Stress = 278W
Difference (GPU load) = 112W
Add average IDLE wattage ~ 19W
Subjective obtained GPU power consumption = ~ 131 Watts
Bear in mind that the system wattage is measured at the wall socket.
TDP in KWh
2 hrs day
4 hrs day
Graphics card measured TDP
Cost 5 days per week / 4 hrs day
Cost per Month
Cost per Year 5 days week / 4 hrs day /
Cost per Year 5 days week / 4 hrs day / $
We estimate and calculate here based on four hours of GPU intensive gaming per day for 5 days a week with this card.
Above, a chart of relative power consumption. Again, the wattages displayed are of the cards with the GPU(s) stressed 100%, showing only the GPU power draw, not the entire PC.
Here is Guru3D's power supply recommendation:
Radeon HD 6870 - On your average system the card requires you to have a 500 Watt power supply unit.
If you are going to overclock CPU or processor, then we do recommend you purchase something with some more stamina.
There are many good PSUs out there, please do have a look at our many PSU reviews as we have loads of recommended PSUs for you to check out in there. What would happen if your PSU can't cope with the load?:
bad 3D performance
spontaneous reset or imminent shutdown of the PC
freezing during gameplay
PSU overload can cause it to break down
Let's move to the next page where we'll look into GPU heat levels and noise levels coming from this graphics card.
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