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Radeon R9 390X 8G vs Radeon RX 6750 XT

Intro

The Radeon R9 390X 8G makes use of a 28 nm design. AMD has clocked the core speed at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular card. It features 2816 SPUs as well as 176 TAUs and 64 ROPs.

Compare all that to the Radeon RX 6750 XT, which makes use of a 7 nm design. AMD has clocked the core speed at 2150 MHz. The GDDR6 memory is set to run at a speed of 2250 MHz on this specific card. It features 2560 SPUs along with 160 Texture Address Units and 64 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6750 XT 250 Watts
Radeon R9 390X 8G 275 Watts
Difference: 25 Watts (10%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 6750 XT is 15% faster than the Radeon R9 390X 8G overall, due to its higher bandwidth. (explain)

Radeon RX 6750 XT 442368 MB/sec
Radeon R9 390X 8G 384000 MB/sec
Difference: 58368 (15%)

Texel Rate

The Radeon RX 6750 XT will be a lot (more or less 86%) more effective at texture filtering than the Radeon R9 390X 8G. (explain)

Radeon RX 6750 XT 344000 Mtexels/sec
Radeon R9 390X 8G 184800 Mtexels/sec
Difference: 159200 (86%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6750 XT is the winner, and very much so. (explain)

Radeon RX 6750 XT 137600 Mpixels/sec
Radeon R9 390X 8G 67200 Mpixels/sec
Difference: 70400 (105%)

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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Radeon R9 390X 8G

Amazon.com

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Radeon RX 6750 XT

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 Radeon R9 390X 8G Radeon RX 6750 XT
Manufacturer AMD AMD
Year June 2015 March 2022
Code Name Grenada XT Navi 22
Memory 8192 MB 12288 MB
Core Speed 1050 MHz 2150 MHz
Memory Speed 6000 MHz 4500 GB/s
Power (Max TDP) 275 watts 250 watts
Bandwidth 384000 MB/sec 442368 MB/sec
Texel Rate 184800 Mtexels/sec 344000 Mtexels/sec
Pixel Rate 67200 Mpixels/sec 137600 Mpixels/sec
Unified Shaders 2816 2560
Texture Mapping Units 176 160
Render Output Units 64 64
Bus Type GDDR5 GDDR6
Bus Width 512-bit 192-bit
Fab Process 28 nm 7 nm
Transistors 6200 million 17200 million
Bus PCIe 3.0 ×16 PCIe 4.0 x16
DirectX Version DirectX 12.0 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon R9 390X 8G

Amazon.com

Check prices at:

Radeon RX 6750 XT

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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