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Radeon HD 6770 vs Radeon HD 7870

Intro

The Radeon HD 6770 makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this specific card. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7870, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this specific model. It features 1280 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7870 6230 points
Radeon HD 6770 1520 points
Difference: 4710 (310%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The Radeon HD 7870 should in theory perform much faster than the Radeon HD 6770 in general. (explain)

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

Texel Rate

The Radeon HD 7870 is much (approximately 122%) more effective at texture filtering than the Radeon HD 6770. (explain)

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

Pixel Rate

The Radeon HD 7870 is quite a bit (approximately 122%) better at AA than the Radeon HD 6770, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6770 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

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 Radeon HD 7870
Manufacturer AMD AMD
Year January 2011 March 2012
Code Name Juniper XT Pitcairn XT
Memory 512 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 maximum amount of information (measured in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high 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 number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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

Display Prices

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Radeon HD 6770

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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