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Radeon HD 7790 vs Radeon R9 M280X

Intro

The Radeon HD 7790 comes with core speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon R9 M280X, which uses a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM runs at a frequency of 1375 MHz on this specific model. It features 896 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon HD 7790 85 Watts
Difference: 10 Watts (13%)

Memory Bandwidth

The Radeon HD 7790, in theory, should be just a bit faster than the Radeon R9 M280X in general. (explain)

Radeon HD 7790 96000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 8000 (9%)

Texel Rate

The Radeon HD 7790 should be a bit (about 11%) better at AF than the Radeon R9 M280X. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 5600 (11%)

Pixel Rate

The Radeon HD 7790 should be a small bit (more or less 11%) faster with regards to anti-aliasing than the Radeon R9 M280X, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 1600 (11%)

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 R9 M280X

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 R9 M280X
Manufacturer AMD AMD
Year March 2013 Feb 9 2015
Code Name Bonaire XT Saturn XT
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 900 MHz
Memory Speed 6000 MHz 5500 MHz
Power (Max TDP) 85 watts 75 watts
Bandwidth 96000 MB/sec 88000 MB/sec
Texel Rate 56000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 896 896
Texture Mapping Units 56 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 2080 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 7790

Amazon.com

Check prices at:

Radeon R9 M280X

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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