Temperature and power-draw
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HIS' IceQ4+ HSF is excellent at cooling the hot-running Radeon HD 4870 GPU. Under-load temperatures are over 20°C lower than the XFX's, which uses the reference cooler, and ambient-to-load is some 22°C lower.
As good as the IceQ4+ is, the Arctic Cooling monster on top of the Inno3D GeForce GTX 260 is even better (and quieter). Load temperature is just 48°C, and it, too, beats out the reference heatsink by over 20°C. We like the AC aftermarket cooler better because it's incredibly quiet in both 2D and 3D scenarios.
Power-draw
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Idle power-draw is a concern on the Radeon HD 4870s, consuming around 30W higher than the GeForce GTX 260s, but under-load they're about the same. 30W may not sound like much, but run 40 hours a week, the extra cost of electricity would be around £7 for a year: it all adds up.