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Radeon HD 5870 vs Radeon HD 7950

Intro

The Radeon HD 5870 makes use of a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this specific card. It features 1600(320x5) SPUs as well as 80 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 7950, which makes use of a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this specific model. It features 1792 SPUs as well as 112 TAUs 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 should in theory be a lot faster than the Radeon HD 5870 overall. (explain)

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

Texel Rate

The Radeon HD 7950 is quite a bit (about 32%) better at texture filtering than the Radeon HD 5870. (explain)

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

Pixel Rate

The Radeon HD 5870 is a bit (about 6%) better at FSAA than the Radeon HD 7950, and should be able to handle higher resolutions better. (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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 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.

Comments

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

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