Of all the current mid-range graphics cards on the market, the Radeon HD 5770 from AMD has proven to be one of the best. It offers great performance, and has other perks such as DirectX 11 and Eyefinity support. With its Vapor-X model, Sapphire has improved the card in numerous ways, including power consumption and temperatures.
To test our graphics cards for both temperatures and power consumption, we utilize OCCT for the stress-testing, GPU-Z for the temperature monitoring, and a Kill-a-Watt for power monitoring. The Kill-a-Watt is plugged into its own socket, with only the PC connect to it.
As per our guidelines when benchmarking with Windows, when the room temperature is stable (and reasonable), the test machine is boot up and left to sit at the Windows desktop until things are completely idle. Once things are good to go, the idle wattage is noted, GPU-Z is started up to begin monitoring card temperatures, and OCCT is set up to begin stress-testing.
To push the cards we test to their absolute limit, we use OCCT in full-screen 2560×1600 mode, and allow it to run for 30 minutes, which includes a one minute lull at the start, and a three minute lull at the end. After about 10 minutes, we begin to monitor our Kill-a-Watt to record the max wattage.
The results are undoubtedly impressive here. Not only did the Vapor-X manage to keep the card 14°C cooler at max load and 9°C at idle, it even managed to have a lower power consumption as well, despite having that 10MHz boost.