In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 M395X 4GB are very slightly better than the AMD Radeon RX 540X 4GB Mobile.

The RX 540X has a 401 MHz higher core clock speed than the R9 M395X, but the R9 M395X has 96 more Texture Mapping Units than the RX 540X. As a result, the R9 M395X exhibits a 56.5 GTexel/s better Texture Fill Rate than the RX 540X. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The RX 540X has a 401 MHz higher core clock speed than the R9 M395X, but the R9 M395X has 16 more Render Output Units than the RX 540X. As a result, the R9 M395X exhibits a 5.1 GPixel/s better Pixel Fill Rate than the RX 540X. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The RX 540X was released over a year more recently than the R9 M395X, and so the RX 540X is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the R9 M395X.

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 RX 540X 4GB Mobile and the Radeon R9 M395X 4GB have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The R9 M395X has 160 GB/sec greater memory bandwidth than the RX 540X, which means that the memory performance of the R9 M395X is massively better than the RX 540X.

The Radeon RX 540X 4GB Mobile has 512 Shader Processing Units and the Radeon R9 M395X 4GB has 2048. However, the actual shader performance of the RX 540X is 624 and the actual shader performance of the R9 M395X is 1259. The R9 M395X having 635 better shader performance and an altogether better performance when taking into account other relevant data means that the R9 M395X delivers a massively smoother and more efficient experience when processing graphical data than the RX 540X.

The RX 540X transistor size technology is 14 nm (nanometers) smaller than the R9 M395X. This means that the RX 540X is expected to run slightly cooler and achieve higher clock frequencies than the R9 M395X.

The Radeon RX 540X 4GB Mobile requires 50 Watts to run and the Radeon R9 M395X 4GB requires 125 Watts. We would recommend a PSU with at least 350 Watts for the RX 540X. The R9 M395X requires 75 Watts more than the RX 540X to run. The difference is significant enough that the R9 M395X may have an adverse affect on your yearly electricity bills in comparison to the RX 540X.