In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce RTX 3090 KFA2 EX Gamer White 24GB are massively better than the AMD Radeon RX 5300.

The RTX 3090 has a 410 MHz higher core clock speed and 232 more Texture Mapping Units than the Radeon RX 5300. This results in the RTX 3090 providing 363.2 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 RTX 3090 has a 410 MHz higher core clock speed and 64 more Render Output Units than the Radeon RX 5300. This results in the RTX 3090 providing 103.4 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 RX 5300 was released less than a year after the RTX 3090, 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 RTX 3090 has 21504 MB more video memory than the Radeon RX 5300, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The Radeon RX 5300 has 168 GB/sec greater memory bandwidth than the RTX 3090, which means that the memory performance of the Radeon RX 5300 is massively better than the RTX 3090.

The GeForce RTX 3090 KFA2 EX Gamer White 24GB has 10496 Shader Processing Units and the Radeon RX 5300 has 1536. However, the actual shader performance of the RTX 3090 is 18263 and the actual shader performance of the Radeon RX 5300 is 1897. The RTX 3090 having 16366 better shader performance and an altogether better performance when taking into account other relevant data means that the RTX 3090 delivers a massively smoother and more efficient experience when processing graphical data than the Radeon RX 5300.

The Radeon RX 5300 transistor size technology is 1 nm (nanometers) smaller than the RTX 3090. This means that the Radeon RX 5300 is expected to run very slightly cooler and achieve higher clock frequencies than the RTX 3090.

The GeForce RTX 3090 KFA2 EX Gamer White 24GB requires 350 Watts to run and the Radeon RX 5300 requires 85 Watts. We would recommend a PSU with at least 750 Watts for the RTX 3090 and a PSU with at least 450 Watts for the Radeon RX 5300. The RTX 3090 requires 265 Watts more than the Radeon RX 5300 to run. The difference is significant enough that the RTX 3090 may have an adverse affect on your yearly electricity bills in comparison to the Radeon RX 5300.