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Radeon HD 7990 vs Radeon R9 280

Intro

The Radeon HD 7990 features a GPU core clock speed of 950 MHz, and the 3072 MB of GDDR5 RAM runs at 1500 MHz through a 384-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon R9 280, which features GPU core speed of 933 MHz, and 3072 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 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 HD 7990 15520 points
Radeon R9 280 7961 points
Difference: 7559 (95%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Radeon R9 280 22 Mh/s
Difference: 10 (45%)

Zcash Mining Hash Rate

Radeon HD 7990 513 Sol/s
Radeon R9 280 183 Sol/s
Difference: 330 (180%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280 250 Watts
Radeon HD 7990 375 Watts
Difference: 125 Watts (50%)

Memory Bandwidth

Performance-wise, the Radeon HD 7990 should theoretically be much better than the Radeon R9 280 overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon R9 280 240000 MB/sec
Difference: 336000 (140%)

Texel Rate

The Radeon HD 7990 is a lot (about 133%) better at texture filtering than the Radeon R9 280. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon R9 280 104496 Mtexels/sec
Difference: 138704 (133%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is a better choice, by a large margin. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon R9 280 29856 Mpixels/sec
Difference: 30944 (104%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 7990

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.

Specifications

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Model Radeon HD 7990 Radeon R9 280
Manufacturer AMD AMD
Year April 2013 March 2014
Code Name Malta Tahiti Pro
Memory 3072 MB (x2) 3072 MB
Core Speed 950 MHz (x2) 933 MHz
Memory Speed 6000 MHz (x2) 5000 MHz
Power (Max TDP) 375 watts 250 watts
Bandwidth 576000 MB/sec 240000 MB/sec
Texel Rate 243200 Mtexels/sec 104496 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 29856 Mpixels/sec
Unified Shaders 2048 (x2) 1792
Texture Mapping Units 128 (x2) 112
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit (x2) 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 4.3 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better 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 maximum amount of pixels the graphics card could 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 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 filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 7990

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.

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