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Radeon HD 6770 1GB vs Radeon HD 6870

Intro

The Radeon HD 6770 1GB uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory is set to run at a speed of 1050 MHz on this specific model. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6870, which features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs along with 56 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
Radeon HD 6870 151 Watts
Difference: 43 Watts (40%)

Memory Bandwidth

The Radeon HD 6870, in theory, should perform a lot faster than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 67200 (100%)

Texel Rate

The Radeon HD 6870 should be a lot (approximately 40%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 6770 1GB 36000 Mtexels/sec
Difference: 14400 (40%)

Pixel Rate

The Radeon HD 6870 should be much (about 100%) better at FSAA than the Radeon HD 6770 1GB, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6770 1GB 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 1GB

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 1GB Radeon HD 6870
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper XT Barts XT
Memory 1024 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 maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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