In terms of overall gaming performance, the graphical capabilities of the AMD Radeon RX 490X 8GB are massively better than the AMD Radeon R9 370X.

The RX 490X and the Radeon R9 370X have the same core clock speed of 1000 MHz, but the RX 490X has 304 more Texture Mapping Units than the Radeon R9 370X. As a result, the RX 490X exhibits a 304 GTexel/s better Texture Fill Rate than the Radeon R9 370X. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The RX 490X and the Radeon R9 370X have the same core clock speed of 1000 MHz, but the RX 490X has 96 more Render Output Units than the Radeon R9 370X. As a result, the RX 490X exhibits a 96 GPixel/s better Pixel Fill Rate than the Radeon R9 370X. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The RX 490X was released less than a year after the Radeon R9 370X, and so they are likely to have similar driver support for optimizing performance 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 RX 490X has 6144 MB more video memory than the Radeon R9 370X, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the Radeon R9 370X has superior memory performance.

The Radeon R9 370X has 179.2 GB/sec greater memory bandwidth than the RX 490X, which means that the memory performance of the Radeon R9 370X is massively better than the RX 490X.

The Radeon RX 490X 8GB has 6144 Shader Processing Units and the Radeon R9 370X has 1280. However, the actual shader performance of the Radeon R9 370X is 1142. The RX 490X having 5002 better shader performance and an altogether better performance when taking into account other relevant data means that the RX 490X delivers a massively smoother and more efficient experience when processing graphical data than the Radeon R9 370X.

The RX 490X transistor size technology is 14 nm (nanometers) smaller than the Radeon R9 370X. This means that the RX 490X is expected to run slightly cooler and achieve higher clock frequencies than the Radeon R9 370X.

The Radeon RX 490X 8GB requires 250 Watts to run and the Radeon R9 370X requires 180 Watts. We would recommend a PSU with at least 600 Watts for the RX 490X and a PSU with at least 500 Watts for the Radeon R9 370X. The RX 490X requires 70 Watts more than the Radeon R9 370X to run. The difference is significant enough that the RX 490X may have an adverse affect on your yearly electricity bills in comparison to the Radeon R9 370X.