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Radeon HD 6770 vs Radeon HD 7870

Intro

The Radeon HD 6770 comes with core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 7870, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also is comprised of 1280 SPUs, 80 TAUs, and 32 Raster Operation 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

Performance-wise, the Radeon HD 7870 should in theory be much better 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 will be much (approximately 122%) better at AF than the Radeon HD 6770. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7870 is superior to the Radeon HD 6770, 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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. The number 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 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max 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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