In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 580 SLI are noticeably better than the AMD FirePro S9150.

The FirePro S9150 has a 128 MHz higher core clock speed and 48 more Texture Mapping Units than the GTX 580. This results in the FirePro S9150 providing 59.6 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 FirePro S9150 has a 128 MHz higher core clock speed than the GTX 580, but the GTX 580 has 32 more Render Output Units than the FirePro S9150. As a result, the GTX 580 exhibits a 16.5 GPixel/s better Pixel Fill Rate than the FirePro S9150. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The FirePro S9150 was released over three years more recently than the GTX 580, and so the FirePro S9150 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GTX 580 when 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 FirePro S9150 has 13312 MB more video memory than the GTX 580, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The GTX 580 has 64.8 GB/sec greater memory bandwidth than the FirePro S9150, which means that the memory performance of the GTX 580 is much better than the FirePro S9150.

The FirePro S9150 has 2816 Shader Processing Units and the GeForce GTX 580 SLI has 1024. However, the actual shader performance of the FirePro S9150 is 2534 and the actual shader performance of the GTX 580 is 1581. The FirePro S9150 having 953 better shader performance is not particularly notable, as altogether the GTX 580 performs better when taking into account other relevant data.

The FirePro S9150 transistor size technology is 12 nm (nanometers) smaller than the GTX 580. This means that the FirePro S9150 is expected to run slightly cooler and achieve higher clock frequencies than the GTX 580.

The FirePro S9150 requires 235 Watts to run and the GeForce GTX 580 SLI requires 488 Watts. The GTX 580 requires 253 Watts more than the FirePro S9150 to run. The difference is significant enough that the GTX 580 may have an adverse affect on your yearly electricity bills in comparison to the FirePro S9150.