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On of our users requested an update with a HD4890, which should be a little hotter compared to the HD6870. Our HD4890 is clocked at 850MHz for the core and 975MHz for the memory. Overclocked versions will of course get hotter. We were pretty impressed with the results so we didn't bother testing at 2000rpm.
HD4890 idle temperatures:
Idle temperatures at 760rpm.
Of course lower with 1000rpm.
Idle temperatures with a 25mm fan at 1000rpm.
HD4890 Furmark:
760rpm; indeed very impressive.
At 1000rpm 5°C less.
The 25mm fan at 1000rpm is of course the best.
Lost Planet 2:
At 760rpm we nearly hit Furmark temperatures, but nothing to worry about.
1000rpm; on par with Furmark.
The 25mm is, as usual, the most efficient.