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Radeon HD 6770 vs Radeon HD 6870

Intro

The Radeon HD 6770 has a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6870, which comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit bus, and uses a 40 nm design. It features 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 6870 151 Watts
Difference: 43 Watts (40%)

Memory Bandwidth

The Radeon HD 6870 should theoretically perform a lot faster than the Radeon HD 6770 in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 67200 (100%)

Texel Rate

The Radeon HD 6870 will be much (approximately 40%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 14400 (40%)

Pixel Rate

The Radeon HD 6870 will be a lot (more or less 100%) faster with regards to AA than the Radeon HD 6770, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 14400 (100%)

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

Radeon HD 6770

Amazon.com

Radeon HD 6870

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

Model Radeon HD 6770 Radeon HD 6870
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper XT Barts XT
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe x16
Memory 512 MB 1024 MB
Core Speed 900 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1050 MHz (4200 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 800 1120
Texture Mapping Units 40 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 108 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 67200 MB/sec 134400 MB/sec
Texel Rate 36000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Comments

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