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GeForce RTX 4090 vs Radeon RX 7900 XTX

Intro

The GeForce RTX 4090 features clock speeds of 2235 MHz on the GPU, and 1325 MHz on the 24576 MB of GDDR6X RAM. It features 16384 SPUs along with 512 Texture Address Units and 176 ROPs.

Compare those specs to the Radeon RX 7900 XTX, which comes with a GPU core clock speed of 1855 MHz, and 24576 MB of GDDR6 RAM running at 2500 MHz through a 384-bit bus. It also is made up of 6144 Stream Processors, 384 TAUs, and 192 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 7900 XTX 355 Watts
GeForce RTX 4090 450 Watts
Difference: 95 Watts (27%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 4090 should be 6% faster than the Radeon RX 7900 XTX overall, due to its greater bandwidth. (explain)

GeForce RTX 4090 1042432 MB/sec
Radeon RX 7900 XTX 983040 MB/sec
Difference: 59392 (6%)

Texel Rate

The GeForce RTX 4090 will be quite a bit (more or less 61%) better at anisotropic filtering than the Radeon RX 7900 XTX. (explain)

GeForce RTX 4090 1144320 Mtexels/sec
Radeon RX 7900 XTX 712320 Mtexels/sec
Difference: 432000 (61%)

Pixel Rate

The GeForce RTX 4090 should be a bit (about 10%) better at anti-aliasing than the Radeon RX 7900 XTX, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce RTX 4090 393360 Mpixels/sec
Radeon RX 7900 XTX 356160 Mpixels/sec
Difference: 37200 (10%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce RTX 4090

Amazon.com

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Radeon RX 7900 XTX

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce RTX 4090 Radeon RX 7900 XTX
Manufacturer nVidia AMD
Year October 2022 December 2022
Code Name AD102 Navi 31 XTX
Memory 24576 MB 24576 MB
Core Speed 2235 MHz 1855 MHz
Memory Speed 1325 GB/s 2500 GB/s
Power (Max TDP) 450 watts 355 watts
Bandwidth 1042432 MB/sec 983040 MB/sec
Texel Rate 1144320 Mtexels/sec 712320 Mtexels/sec
Pixel Rate 393360 Mpixels/sec 356160 Mpixels/sec
Unified Shaders 16384 6144
Texture Mapping Units 512 384
Render Output Units 176 192
Bus Type GDDR6X GDDR6
Bus Width 384-bit 384-bit
Fab Process 4 nm 5 nm
Transistors 76300 million 57700 million
Bus PCIe 4.0 x16 PCIe 4.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.6 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce RTX 4090

Amazon.com

Check prices at:

Radeon RX 7900 XTX

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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