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Radeon HD 7970 vs Radeon R9 285

Intro

The Radeon HD 7970 has clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Compare that to the Radeon R9 285, which comes with core speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

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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 285 8500 points
Radeon HD 7970 8225 points
Difference: 275 (3%)

Ethereum Mining Hash Rate

Radeon HD 7970 21 Mh/s
Radeon R9 285 18 Mh/s
Difference: 3 (17%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285 190 Watts
Radeon HD 7970 250 Watts
Difference: 60 Watts (32%)

Memory Bandwidth

The Radeon HD 7970 should theoretically perform much faster than the Radeon R9 285 overall. (explain)

Radeon HD 7970 264000 MB/sec
Radeon R9 285 176000 MB/sec
Difference: 88000 (50%)

Texel Rate

The Radeon HD 7970 is a bit (approximately 15%) faster with regards to anisotropic filtering than the Radeon R9 285. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon R9 285 102816 Mtexels/sec
Difference: 15584 (15%)

Pixel Rate

The Radeon HD 7970 is a little bit (approximately 1%) faster with regards to FSAA than the Radeon R9 285, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon R9 285 29376 Mpixels/sec
Difference: 224 (1%)

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 7970

Amazon.com

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Radeon R9 285

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 7970 Radeon R9 285
Manufacturer AMD AMD
Year January 2012 September 2014
Code Name Tahiti XT Tonga PRO
Memory 3072 MB 2048 MB
Core Speed 925 MHz 918 MHz
Memory Speed 5500 MHz 5500 MHz
Power (Max TDP) 250 watts 190 watts
Bandwidth 264000 MB/sec 176000 MB/sec
Texel Rate 118400 Mtexels/sec 102816 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 29376 Mpixels/sec
Unified Shaders 2048 1792
Texture Mapping Units 128 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 5000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.4

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, 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 worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 7970

Amazon.com

Check prices at:

Radeon R9 285

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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