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Radeon HD 6770 1GB vs Radeon HD 7870

Intro

The Radeon HD 6770 1GB has a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 7870, which comes with a clock frequency of 1000 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 is made up of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
Radeon HD 7870 175 Watts
Difference: 67 Watts (62%)

Memory Bandwidth

The Radeon HD 7870, in theory, should be much faster than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 86400 (129%)

Texel Rate

The Radeon HD 7870 should be a lot (more or less 122%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 6770 1GB 36000 Mtexels/sec
Difference: 44000 (122%)

Pixel Rate

The Radeon HD 7870 is quite a bit (about 122%) better at FSAA than the Radeon HD 6770 1GB, and should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 17600 (122%)

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

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Radeon HD 7870

Amazon.com

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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 7870
Manufacturer AMD AMD
Year January 2011 March 2012
Code Name Juniper XT Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 4800 MHz
Power (Max TDP) 108 watts 175 watts
Bandwidth 67200 MB/sec 153600 MB/sec
Texel Rate 36000 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 800 1280
Texture Mapping Units 40 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 2800 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 6770 1GB

Amazon.com

Check prices at:

Radeon HD 7870

Amazon.com

Check prices at:

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.

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