These are my own tests.
I've owned a VF900 for a while, and my friend owns a Accelero S1 so I used both those two coolers in this test. We didn't have a good fan to hand for the Accelero so I had to zip tie a 120mm TriCool Antec fan with it's switch set to "M" for the tests. The DuOrb I received this morning and added it into the tests as well. I'd like to point out however the Accelero S1 was attached to his card in the tests (he also owns a 4850) however we tested all the cards in my room in the same environments. If you want to discount the Accelero results because of that please do (I wasn't really inclined to take his cooler of his card and attach it to mine when they are the same cards).
The VF900 and VF1000's fan speed's was set to midway on a Zalman Fan Mate 2. This would make it about 1850 RPM.
Case cooling: Antec P180, not top exhaust, rear exhaust @ low, intake from middle HDD bay @ M, lower PSU cage fan @ M. CPU cooler is Zalman CNPS9700-LED attached to a Fan Mate set to medium.
Ambient room temperature at the time of testing was: 27c - 29c. We couldn't keep the temperature in the room stable due to lack of air conditioning so take that into account on the results. Something else to note also is that the temperatures will probably go down a couple of degrees across the board when the paste had set but it never got time to do that during testing as it normally takes weeks.
You might wonder why my results with the Accelero S1 are so much higher than that chart floating around with the 32c idle, 39c load. Well that's probably because he used RTHDRIBL which doesn't really stress the card to levels that ATI Tool seems to do, kinda seems like when you are testing your CPU and you set the priority from 1 to 8. When I ran RTHDRIBL with the DuOrb the load temps never went above 44c, compared to 57c with ATi Tool.
Hope this helps anyone at least, was just attempting to show the difference between the coolers since I was lucky enough to have all of them to hand
Links to the coolers:
Thermaltake DuOrb - £30.54
Zalman VF900 - £23.49
Arctic Cooling Accelero S1 Rev. 2 - £15.26 ** Fanless **
Zalman VF1000-LED - £31.71
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