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Radeon HD 6850 vs Radeon HD 7770

Intro

The Radeon HD 6850 has a GPU core clock speed of 775 MHz, and the 1024 MB of GDDR5 memory is set to run at 1000 MHz through a 256-bit bus. It also features 960 SPUs, 48 Texture Address Units, and 32 ROPs.

Compare that to the Radeon HD 7770, which has a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation 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 7770 80 Watts
Radeon HD 6850 127 Watts
Difference: 47 Watts (59%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6850 is 78% quicker than the Radeon HD 7770 in general, due to its higher bandwidth. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 56000 (78%)

Texel Rate

The Radeon HD 7770 will be a small bit (more or less 8%) more effective at AF than the Radeon HD 6850. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 2800 (8%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6850 is the winner, by a large margin. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 8800 (55%)

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 6850

Amazon.com

Radeon HD 7770

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 6850 Radeon HD 7770
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts Pro Cape Verde XT
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 775 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 960 640
Texture Mapping Units 48 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 127 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 128000 MB/sec 72000 MB/sec
Texel Rate 37200 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

9 Responses to “Radeon HD 6850 vs Radeon HD 7770”
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[...] mismo renombrado y cambiado el hdmi a 1.4a en vez hdmi 1.3 Ahora pongo la 6850 frente a la 7770 Radeon HD 6850 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare Perdona pero decir que una 7770 es un reemplazo de la 5770 o 6770 es un insulto a nuestra [...]
[...] Posted by CarlonSamuels Got some extra cash i am going with the HD 7770 !!!!!!! Radeon HD 6850 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare Check this out !!!! HD7770 (128 bit) beats the HD6850 (256 bit) only in power consumption. But [...]
[...] or MSI 7770. Your expert advice on which to choose, topgear? Or should I make a new thread? Radeon HD 6850 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare Performance wise HD6850(256 bit) is always better than HD7770(128 bit), although HD7770 with its [...]
[...] More gpu insight >Saphire Radeon HD 6850 Radeon HD 7770 Radeon HD 6850 The differences between them $20 difference with the 6850 being better than the 7770. If you can spring for it, go for the [...]
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[...] VGA..comunque ti assicuro che sia una 6850 che una 6870....gliele suonano di brutto ad una 7770... Radeon HD 6850 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare Radeon HD 6870 vs Radeon HD 7770 – Performance Comparison Benchmarks @ Hardware Compare per [...]
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