In terms of overall gaming performance, the graphical capabilities of the Nvidia Quadro FX 3800M are very slightly better than the Nvidia GeForce 920M 2GB.

The GeForce 920M 2GB was released over three years more recently than the Quadro FX 3800M, and so the GeForce 920M 2GB is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Quadro FX 3800M when running the latest games.

The GeForce 920M 2GB has 1024 MB more video memory than the Quadro FX 3800M, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the Quadro FX 3800M has superior memory performance.

The Quadro FX 3800M has 49.6 GB/sec greater memory bandwidth than the GeForce 920M 2GB, which means that the memory performance of the Quadro FX 3800M is noticeably better than the GeForce 920M 2GB.

The GeForce 920M 2GB has 384 Shader Processing Units and the Quadro FX 3800M has 128. However, the actual shader performance of the GeForce 920M 2GB is 366 and the actual shader performance of the Quadro FX 3800M is 86. The GeForce 920M 2GB having 280 better shader performance is not particularly notable, as altogether the Quadro FX 3800M performs better when taking into account other relevant data.

The GeForce 920M 2GB transistor size technology is 37 nm (nanometers) smaller than the Quadro FX 3800M. This means that the GeForce 920M 2GB is expected to run much cooler and achieve higher clock frequencies than the Quadro FX 3800M. While they exhibit similar graphical performance, the GeForce 920M 2GB should consume less power than the Quadro FX 3800M.

The GeForce 920M 2GB requires 25 Watts to run and the Quadro FX 3800M requires 100 Watts. The Quadro FX 3800M requires 75 Watts more than the GeForce 920M 2GB to run. The difference is significant enough that the Quadro FX 3800M may have an adverse affect on your yearly electricity bills in comparison to the GeForce 920M 2GB.