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Radeon HD 5870 vs Radeon HD 7950

Intro

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

Compare all that to the Radeon HD 7950, which uses a 28 nm design. ATi has set the core frequency at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this specific model. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

(No game benchmarks for this combination yet.)

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

In theory, the Radeon HD 7950 should be 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 much (about 32%) better at AF than the Radeon HD 5870. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 5870 is superior to the Radeon HD 7950, not by a very large margin though. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 5870

Amazon.com

Other US-based stores

Radeon HD 7950

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 5870 Radeon HD 7950
Manufacturer ATi ATi
Year September 23, 2009 January 2012
Code Name Cypress XT Tahiti Pro
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1536 MB
Core Speed 850 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1250 MHz (5000 MHz effective)
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
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2
Power (Max TDP) 188 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 68000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Comments

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