Temperature measurements
We do not measure the temperatures in the open test setup, but in a smaller case with a perforated side panel to guarantee as much practical relevance as possible. A Core i3 2130 on an mATX board from MSI is used. The installed 8 GB RAM is standard for Windows Ultimate x64 by now, and a hard drive with 1 TB represents a reasonably good-sized data grave.
The Sapphire 7750 Ultimate has a heatsink that also protrudes to the rear, which is guaranteed to severely affect use on Mini-ITX systems with larger CPU coolers and is not optimally designed even on Micro-ATX boards. Here you have to measure exactly beforehand! When coolers collide, but see for yourself:
Measurements in detail
The idle temperatures were on average between 30°C and 33°C for all cards. The room temperature was a constant 22°C for all tests. Since the passive cards warm up more slowly, we logged the temperature course for over 15 minutes until nothing changed.
Interestingly, when gaming with 60-80% load, the HIS card can undercut the next-ranked Sapphire card by almost 10 Kelvin, which is an absolute top value. We suspect that the 4 large heatpipes and the elongated heat sink that only protrudes at the back are responsible for this good result. In the stress test, a certain tie is reached between the two cards after a few minutes. The PowerColor card is the hottest card in all tests, although even its measured values are still absolutely in the green zone.
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