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Radeon R9 390 8G vs Radeon RX 6750 XT

Intro

The Radeon R9 390 8G has a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 512-bit bus, and uses a 28 nm design. It is made up of 2560 SPUs, 160 Texture Address Units, and 64 Raster Operation Units.

Compare those specs to the Radeon RX 6750 XT, which makes use of a 7 nm design. AMD has set the core speed at 2150 MHz. The GDDR6 RAM is set to run at a frequency of 2250 MHz on this specific card. It features 2560 SPUs as well as 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 390 8G 275 Watts
Difference: 25 Watts (10%)

Memory Bandwidth

The Radeon RX 6750 XT should in theory perform a small bit faster than the Radeon R9 390 8G overall. (explain)

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

Texel Rate

The Radeon RX 6750 XT will be a lot (about 115%) better at texture filtering than the Radeon R9 390 8G. (explain)

Radeon RX 6750 XT 344000 Mtexels/sec
Radeon R9 390 8G 160000 Mtexels/sec
Difference: 184000 (115%)

Pixel Rate

The Radeon RX 6750 XT should be much (about 115%) faster with regards to FSAA than the Radeon R9 390 8G, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon RX 6750 XT 137600 Mpixels/sec
Radeon R9 390 8G 64000 Mpixels/sec
Difference: 73600 (115%)

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 390 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 390 8G Radeon RX 6750 XT
Manufacturer AMD AMD
Year June 2015 March 2022
Code Name Grenada PRO Navi 22
Memory 8192 MB 12288 MB
Core Speed 1000 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 160000 Mtexels/sec 344000 Mtexels/sec
Pixel Rate 64000 Mpixels/sec 137600 Mpixels/sec
Unified Shaders 2560 2560
Texture Mapping Units 160 160
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: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon R9 390 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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