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Radeon HD 6970 vs Radeon HD 7850

Intro

The Radeon HD 6970 features a core clock frequency of 880 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare that to the Radeon HD 7850, which comes with core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6970 250 Watts
Difference: 120 Watts (92%)

Memory Bandwidth

The Radeon HD 6970 should in theory perform a little bit faster than the Radeon HD 7850 overall. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 22400 (15%)

Texel Rate

The Radeon HD 6970 should be much (about 53%) more effective at anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 29440 (53%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6970 is a better choice, but only just. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 640 (2%)

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 6970

Amazon.com

Radeon HD 7850

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 6970 Radeon HD 7850
Manufacturer AMD AMD
Year December 2010 March 2012
Code Name Cayman XT Pitcairn Pro
Memory 2048 MB 2048 MB
Core Speed 880 MHz 860 MHz
Memory Speed 5500 MHz 4800 MHz
Power (Max TDP) 250 watts 130 watts
Bandwidth 176000 MB/sec 153600 MB/sec
Texel Rate 84480 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 1536 1024
Texture Mapping Units 96 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 2800 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

One Response to “Radeon HD 6970 vs Radeon HD 7850”
Anonymous says:

[...] viel von der Leistung her, lediglich braucht die 7850 weniger Strom und hat den neueren Chip. Radeon HD 6970 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare Verkaufe GW2 Acc mit Lvl80 Guardian & 5G (gold/orange equippt) Hardware: Bitfenix Prodigy [...]

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