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Radeon HD 6870 vs Radeon HD 7790


Intro

The Radeon HD 6870 comes with a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It features 1120 SPUs, 56 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 7790, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 TAUs, and 16 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 7790 4330 points
Radeon HD 6870 2870 points
Difference: 1460 (51%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 6870 151 Watts
Difference: 66 Watts (78%)

Memory Bandwidth

Theoretically, the Radeon HD 6870 should perform quite a bit faster than the Radeon HD 7790 overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 38400 (40%)

Texel Rate

The Radeon HD 7790 will be a small bit (about 11%) better at AF than the Radeon HD 6870. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 5600 (11%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6870 is a better choice, by far. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7790 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

Amazon.com

Radeon HD 7790

Amazon.com

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 7790
Manufacturer AMD AMD
Year October 2010 March 2013
Code Name Barts XT Bonaire XT
Memory 1024 MB 1024 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 6000 MHz
Power (Max TDP) 151 watts 85 watts
Bandwidth 134400 MB/sec 96000 MB/sec
Texel Rate 50400 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1120 896
Texture Mapping Units 56 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 2080 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour 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 lots of 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 6870

Amazon.com

Radeon HD 7790

Amazon.com

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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