In terms of overall gaming performance, the graphical capabilities of the Radeon R9 280 and the HD 7950 are equal.
The HD 7950 has a 73 MHz higher core clock speed and the same number of Texture Mapping Units as the Radeon R9 280. This results in the HD 7950 providing 8.2 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The HD 7950 has a 73 MHz higher core clock speed than the Radeon R9 280 and the same number of Render Output Units. This results in the HD 7950 providing 2.3 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The Radeon R9 280 was released over a year more recently than the HD 7950, and so the Radeon R9 280 is likely to have better driver support, meaning it will be more optimized for running the latest games.
Both GPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings.
The Radeon R9 280 and the Radeon HD 7950 Sapphire OC 3GB Edition have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.
The memory bandwidth of the Radeon R9 280 and the Radeon HD 7950 Sapphire OC 3GB Edition are the same, which means the Radeon R9 280 and the HD 7950 have equal limitations when it comes to graphical data transfer.
Both the Radeon R9 280 and the Radeon HD 7950 Sapphire OC 3GB Edition have 1792 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the . Knowing that the shader performance of the Radeon R9 280 is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.
The Radeon R9 280 requires 200 Watts to run but there is no entry for the Radeon HD 7950 Sapphire OC 3GB Edition. We would recommend a PSU with at least 500 Watts for the Radeon R9 280 and a PSU with at least 500 Watts for the HD 7950. The two GPUs have been recommended a PSU with the same amount of wattage. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.