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Radeon HD 7790 vs Radeon RX 480 4GB

Intro

The Radeon HD 7790 comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon RX 480 4GB, which comes with core clock speeds of 1120 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 2304 SPUs as well as 144 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon RX 480 4GB 150 Watts
Difference: 65 Watts (76%)

Memory Bandwidth

The Radeon RX 480 4GB, in theory, should be quite a bit faster than the Radeon HD 7790 overall. (explain)

Radeon RX 480 4GB 229376 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 133376 (139%)

Texel Rate

The Radeon RX 480 4GB will be quite a bit (about 188%) more effective at AF than the Radeon HD 7790. (explain)

Radeon RX 480 4GB 161280 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 105280 (188%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 480 4GB is superior to the Radeon HD 7790, and very much so. (explain)

Radeon RX 480 4GB 35840 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 19840 (124%)

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 HD 7790

Amazon.com

Check prices at:

Radeon RX 480 4GB

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.

Specifications

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Model Radeon HD 7790 Radeon RX 480 4GB
Manufacturer AMD AMD
Year March 2013 June 2016
Code Name Bonaire XT Polaris 10
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 1120 MHz
Memory Speed 6000 MHz 7000 MHz
Power (Max TDP) 85 watts 150 watts
Bandwidth 96000 MB/sec 229376 MB/sec
Texel Rate 56000 Mtexels/sec 161280 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 35840 Mpixels/sec
Unified Shaders 896 2304
Texture Mapping Units 56 144
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 14 nm
Transistors 2080 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 7790

Amazon.com

Check prices at:

Radeon RX 480 4GB

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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