Sapphire Radeon 5770 FleX Edition
To test temperatures, it is a simple matter of firing up FurMark and letting it run for awhile until the temperatures level out. FurMark pushes GPU thermal loads extremely high, and can be considered a worst-case scenario.
As we expected, the cooler on the Sapphire 5770 FleX isn’t nearly as impressive as the one found on their Vapor-X card. The idle temperature on the FleX is a very good 38°C, but the load temperature jumps considerably to 80°C. However, the fan could be run manually at higher RPMs, and at full load the fan isn’t very loud so that is an option.