the graphics card is pretty good, overclocks very well, and is pretty stable. more importantly, the cooling system on this card is not reference, meaning you get better cooling with the dual blowers. be warned though, if you have a uefi fast boot system, you need uefi gop on your graphics card too, which sapphire refuses to release at this time. companies like MSI do release this, so take a look at their twin frozr 3 line for comparable performance.
The SAPPHIRE HD 7950 3GB with Boost features SAPPHIRE's new dual-extractor technology - Dual-X - a highly efficient multi-heatpipe cooler with dual fans providing quiet and very cool operation during normal operating conditions, and superb cooling performance even under extreme load. SAHHPIRE HD 7950 3GB with Boost now has the latest GDDR5 memory clocked at 5000MHz effective, and runs with a core clock speed of 850 MHz which with PowerTune Dynamic Boost rises to 925 MHz on the engine.
For enthusiasts wishing to maximise performance, a new version of the SAPPHIRE overclocking tool, TriXX supporting this latest generation of technology is available free to download from the SAPPHIRE website. TriXX allows tuning of GPU voltage as well as core and memory clocks, whilst continuously displaying temperature. Manual control of fan speed is supported, as well as user created fan profiles and the ability to save up to four different performance settings.