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Radeon HD 6770 vs Radeon HD 6870

Intro

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

Compare all of that to the Radeon HD 6870, which has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It features 1120 SPUs, 56 Texture Address Units, and 32 Raster Operation Units.

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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

As far as performance goes, the Radeon HD 6870 should in theory be quite a bit superior to 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%) more effective at 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 is much (more or less 100%) more effective at full screen anti-aliasing than the Radeon HD 6770, and also will be capable of handling higher resolutions while still performing well. (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

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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

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Model Radeon HD 6770 Radeon HD 6870
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper XT Barts XT
Memory 512 MB 1024 MB
Core Speed 900 MHz 900 MHz
Memory Speed 4200 MHz 4200 MHz
Power (Max TDP) 108 watts 151 watts
Bandwidth 67200 MB/sec 134400 MB/sec
Texel Rate 36000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800 1120
Texture Mapping Units 40 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

One Response to “Radeon HD 6770 vs Radeon HD 6870”
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