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Radeon HD 6870 vs Radeon HD 7870

Intro

The Radeon HD 6870 features a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 memory is set to run at 1050 MHz through a 256-bit bus. It also is comprised of 1120 Stream Processors, 56 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 7870, which has core speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs along with 80 TAUs 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 6870 2870 points
Difference: 3360 (117%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 7870 175 Watts
Difference: 24 Watts (16%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 will be 14% quicker than the Radeon HD 6870 overall, because of its greater bandwidth. (explain)

Radeon HD 7870 153600 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 7870 is a lot (more or less 59%) better at texture filtering than the Radeon HD 6870. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 29600 (59%)

Pixel Rate

The Radeon HD 7870 is a small bit (more or less 11%) better at FSAA than the Radeon HD 6870, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6870 28800 Mpixels/sec
Difference: 3200 (11%)

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

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 6870 Radeon HD 7870
Manufacturer AMD AMD
Year October 2010 March 2012
Code Name Barts XT Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 4800 MHz
Power (Max TDP) 151 watts 175 watts
Bandwidth 134400 MB/sec 153600 MB/sec
Texel Rate 50400 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1120 1280
Texture Mapping Units 56 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 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 largest amount of information (measured in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 are applied in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 6870

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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