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Radeon HD 5870 vs Radeon HD 7950

Intro

The Radeon HD 5870 features a GPU clock speed of 850 MHz, and the 1024 MB of GDDR5 RAM runs at 1200 MHz through a 256-bit bus. It also is made up of 1600(320x5) Stream Processors, 80 TAUs, and 32 ROPs.

Compare all of that to the Radeon HD 7950, which features clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1536 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon HD 7950 200 Watts
Difference: 12 Watts (6%)

Memory Bandwidth

The Radeon HD 7950, in theory, should perform quite a bit faster than the Radeon HD 5870 in general. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 86400 (56%)

Texel Rate

The Radeon HD 7950 is a lot (more or less 32%) faster with regards to anisotropic filtering than the Radeon HD 5870. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 21600 (32%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5870 is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 1600 (6%)

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 5870

Amazon.com

Radeon HD 7950

Amazon.com

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 5870 Radeon HD 7950
Manufacturer AMD AMD
Year September 23, 2009 January 2012
Code Name Cypress XT Tahiti Pro
Memory 1024 MB 1536 MB
Core Speed 850 MHz 800 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 188 watts 200 watts
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 68000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1600(320x5) 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 2154 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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 of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Comments

One Response to “Radeon HD 5870 vs Radeon HD 7950”
Anonymous says:

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