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Radeon HD 6870 vs Radeon HD 7790


Intro

The Radeon HD 6870 has a GPU core speed of 900 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1050 MHz through a 256-bit bus. It also features 1120 SPUs, 56 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7790, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also features 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 speaking, the Radeon HD 6870 should be a lot 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 should be just a bit (more or less 11%) more effective 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

The Radeon HD 6870 will be quite a bit (about 80%) better at FSAA than the Radeon HD 7790, and also should be able to handle higher resolutions more effectively. (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

Radeon HD 6870

Radeon HD 7790

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 information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, 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 number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 6870

Radeon HD 7790

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