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Radeon HD 6970 vs Radeon HD 7850

Intro

The Radeon HD 6970 has a GPU core clock speed of 880 MHz, and the 2048 MB of GDDR5 RAM runs at 1375 MHz through a 256-bit bus. It also features 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon HD 7850, which has a core clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It features 1024 SPUs, 64 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

As far as performance goes, the Radeon HD 6970 should in theory be a bit better 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 will be much (more or less 53%) faster with regards to texture filtering than the Radeon HD 7850. (explain)

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

Pixel Rate

The Radeon HD 6970 will be just a bit (more or less 2%) better at anti-aliasing than the Radeon HD 7850, and able to handle higher screen resolutions while still performing well. (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

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 6970

Amazon.com

Other US-based stores

Radeon HD 7850

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 6970 Radeon HD 7850
Manufacturer ATi ATi
Year December 2010 March 2012
Code Name Cayman XT Pitcairn Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 880 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1375 MHz (5500 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1536 1024
Texture Mapping Units 96 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 250 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 176000 MB/sec 153600 MB/sec
Texel Rate 84480 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

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