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Radeon HD 6870 vs Radeon HD 7770


The Radeon HD 6870 has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs as well as 56 TAUs and 32 ROPs.

Compare all of that to the Radeon HD 7770, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6870 151 Watts
Difference: 71 Watts (89%)

Memory Bandwidth

The Radeon HD 6870 should theoretically perform a lot faster than the Radeon HD 7770 in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 62400 (87%)

Texel Rate

The Radeon HD 6870 is much (about 26%) faster with regards to AF than the Radeon HD 7770. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 10400 (26%)

Pixel Rate

The Radeon HD 6870 will be a lot (approximately 80%) better at full screen anti-aliasing than the Radeon HD 7770, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 12800 (80%)

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 6870

Radeon HD 7770

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.


Display Specifications

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Model Radeon HD 6870 Radeon HD 7770
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 4500 MHz
Power (Max TDP) 151 watts 80 watts
Bandwidth 134400 MB/sec 72000 MB/sec
Texel Rate 50400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1120 640
Texture Mapping Units 56 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 1500 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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.


3 Responses to “Radeon HD 6870 vs Radeon HD 7770”
james says:

Are you using pice 2 or pcie 3


Aaron says:

It would have to be PCI-e 2.0 or 2.1 because the 6970 doesn't support PCI-e 3.0, and the theoretical benchmarks are not dependent on PCI-e speed. Anyway, you should get the 6870 instead of the 7770, the 68xx series has the BEST price to performance ratio of ANY AMD/ATI radeon HD graphics card.

[DOMANDA] Quale produttore per 550ti (versioni oc) - Pagina 2 says:

[...] HD 6870 will be a lot (approximately 26%) faster with regards to AF than the Radeon HD 7770. (explain)Radeon HD 6870 50400 Mtexels/sec Radeon HD 7770 40000 Mtexels/sec Difference: 10400 (26%) [...]

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