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Radeon HD 7950 vs Radeon R9 M280X

Intro

The Radeon HD 7950 has a GPU core speed of 800 MHz, and the 1536 MB of GDDR5 RAM runs at 1250 MHz through a 384-bit bus. It also is comprised of 1792 SPUs, 112 TAUs, and 32 ROPs.

Compare those specs to the Radeon R9 M280X, which comes with a core clock speed of 900 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X 75 Watts
Radeon HD 7950 200 Watts
Difference: 125 Watts (167%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 will be 173% faster than the Radeon R9 M280X in general, due to its higher data rate. (explain)

Radeon HD 7950 240000 MB/sec
Radeon R9 M280X 88000 MB/sec
Difference: 152000 (173%)

Texel Rate

The Radeon HD 7950 will be much (about 78%) more effective at texture filtering than the Radeon R9 M280X. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon R9 M280X 50400 Mtexels/sec
Difference: 39200 (78%)

Pixel Rate

The Radeon HD 7950 is quite a bit (approximately 78%) better at AA than the Radeon R9 M280X, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon R9 M280X 14400 Mpixels/sec
Difference: 11200 (78%)

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 7950

Amazon.com

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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 7950 Radeon R9 M280X
Manufacturer AMD AMD
Year January 2012 Feb 9 2015
Code Name Tahiti Pro Saturn XT
Memory 1536 MB 4096 MB
Core Speed 800 MHz 900 MHz
Memory Speed 5000 MHz 5500 MHz
Power (Max TDP) 200 watts 75 watts
Bandwidth 240000 MB/sec 88000 MB/sec
Texel Rate 89600 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 1792 896
Texture Mapping Units 112 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 384-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 7950

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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