Gigabyte Volar CPU Cooler Review
 

The trend from the first test continued through to the second. With the FSB and voltage raised, the Gigabyte Volar again came out on top of the Zalman 9500LED. The Volar handled the extra heat extremely well and beat the 9500LED by two degrees and the Intel by ten degrees during idle at 1.375v. Again, I turned up the load and the gap steadily increased, resting at 52 degrees Celsius, a total difference of three degrees between the Volar and 9500LED. It is evident that the Intel heatsink cannot cope with the extra voltage and is pushing the thermal threshold of the CPU. The efficiency of the Volar is a nice improvement over the Zalman and with the ceiling of 60-65 degrees for most processors, three degrees could be the difference between a stable and unstable overclock.

http://www.overclockersclub.com/reviews/gigabyte_volar/