Testing Methodology and Thermal Results
To test the effectiveness of this and every cooler on the charts I used Unigine Heaven Bench to stress to the cards. As for the setting for each run, I set it to run windowed mode at 1280 X 1024 resolution with AA and AF levels maxed out. This was allowed to run for an hour so I was secure in the fact that I had reached the maximum temperatures for each cooler. To record the temperatures, fan speeds and percentages and all other vitals I used GPU-z. To move from stock clocks and fan slopes I used MSI Afterburner to move from the stock clocks of 732/950/1464 (core/memory/shaders) to the overclock I used of 900/950/1800. I didn't push the memory much as I didn't find an overvolt feature for them and the speed doesn't deliver much more heat all on the same voltage. To make sure the playing field was level; all three of the coolers used in this round were tested under a 26 degree Celsius reading.
Also I did address the fact of using two fans in a push/pull configuration with a fan off my shelf that offered as close to 74 CFM as I had available. The extra fan was rated to 80CFM, but it was as close as I could get without grossly overshooting the levels of the F12 PWM that was included.
At idle the Hybrid was outshined a bit by the much more affordable Thermalright Shaman. Now one big thing in this is that I had to mod my Shaman to fit, whereas the Accelero Hybrid fit the GTX 570 right out of the box. The real saving grace here is when I ran dual fans and the Hybrid then jumped ahead of the Thermalright a couple of degrees. In all honestly, as far as I'm concerned, all of these idle temperatures are pretty good and this end of the cooling isn't so much where my concerns are.
Without the overclock applied the Shaman steps just in front of the Accelero Hybrid in the single fan configuration, but once we added a second fan the ARCTIC solution moved down another five degrees to top the chart. The same thing was found when the overclock was applied. The Shaman was five degrees better until the second fan was added, then the Hybrid pulled ahead by three degrees over it. As for the Galaxy stock cooler results, well, they are just sad really in comparison.
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