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Radeon HD 5870 vs Radeon HD 7950

Intro

The Radeon HD 5870 features a GPU core speed of 850 MHz, and the 1024 MB of GDDR5 memory runs at 1200 MHz through a 256-bit bus. It also features 1600(320x5) Stream Processors, 80 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon HD 7950, which makes use of a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific card. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

Display Graphs

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(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

Theoretically speaking, the Radeon HD 7950 should be 56% quicker than the Radeon HD 5870 overall, due to its greater bandwidth. (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 (more or less 32%) faster with regards to 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 will be just a bit (approximately 6%) more effective at full screen anti-aliasing than the Radeon HD 7950, and should be able to handle higher screen resolutions without losing too much performance. (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

Display Prices

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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

Display 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
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 maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high 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 number 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory 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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