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Radeon HD 7950 vs Radeon R9 280

Intro

The Radeon HD 7950 has a GPU core speed of 800 MHz, and the 1536 MB of GDDR5 memory runs at 1250 MHz through a 384-bit bus. It also is made up of 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 280, which has GPU clock speed of 933 MHz, and 3072 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also features 1792 SPUs, 112 TAUs, and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 280 7961 points
Radeon HD 7950 7731 points
Difference: 230 (3%)

Zcash Mining Hash Rate

Radeon HD 7950 235 Sol/s
Radeon R9 280 183 Sol/s
Difference: 52 (28%)

Ethereum Mining Hash Rate

Radeon R9 280 22 Mh/s
Radeon HD 7950 21 Mh/s
Difference: 1 (5%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Radeon R9 280 250 Watts
Difference: 50 Watts (25%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon R9 280 should be a little bit (approximately 17%) faster with regards to anisotropic filtering than the Radeon HD 7950. (explain)

Radeon R9 280 104496 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 14896 (17%)

Pixel Rate

The Radeon R9 280 will be a small bit (about 17%) faster with regards to FSAA than the Radeon HD 7950, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 280 29856 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 4256 (17%)

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 280

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 HD 7950 Radeon R9 280
Manufacturer AMD AMD
Year January 2012 March 2014
Code Name Tahiti Pro Tahiti Pro
Memory 1536 MB 3072 MB
Core Speed 800 MHz 933 MHz
Memory Speed 5000 MHz 5000 MHz
Power (Max TDP) 200 watts 250 watts
Bandwidth 240000 MB/sec 240000 MB/sec
Texel Rate 89600 Mtexels/sec 104496 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 29856 Mpixels/sec
Unified Shaders 1792 1792
Texture Mapping Units 112 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 4313 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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7950

Amazon.com

Check prices at:

Radeon R9 280

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.

Comments

One Response to “Radeon HD 7950 vs Radeon R9 280”
Jom says:

7950 does not have 1500 MB of RAM, it has 3G. Not at 800 MHz, it is at 850, auto-boosts to 925 if not hot. R9 has 850, boosts to 950 is not hot (1000 for the OC). It also has the same bus width, print density, mapping units and texture units becaue it's the same fucking card. It is not 17% better, not higher TDP.

This is basically all you do. Compare cards. You can't catch on the same card being the same? Way to provide a service. 10 buttons so I can share my findings with the world, not one to report an issue. The bloody frame with prices ALL say 7950 3GB. You didn't even read your own page.

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