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Radeon HD 6770 vs Radeon HD 7870

Intro

The Radeon HD 6770 features a GPU core clock speed of 900 MHz, and the 512 MB of GDDR5 memory is set to run at 1050 MHz through a 128-bit bus. It also is made up of 800 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 7870, which features GPU core speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 Texture Address Units, and 32 ROPs.

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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

In theory, the Radeon HD 7870 should perform much faster than the Radeon HD 6770 overall. (explain)

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

Texel Rate

The Radeon HD 7870 should be much (about 122%) faster with regards to 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

If using a high resolution is important to you, then the Radeon HD 7870 is a better choice, by far. (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

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.

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: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach 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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