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Radeon HD 6790 vs Radeon HD 6870

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM works at a frequency of 1050 MHz on this particular model. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 6870, which uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this particular model. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 6870 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 6870 should be quite a bit (approximately 50%) more effective at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 16800 (50%)

Pixel Rate

The Radeon HD 6870 is quite a bit (more or less 114%) better at full screen anti-aliasing than the Radeon HD 6790, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 15360 (114%)

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 6790

Amazon.com

Radeon HD 6870

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

Display Specifications

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Model Radeon HD 6790 Radeon HD 6870
Manufacturer AMD AMD
Year April 2011 October 2010
Code Name Barts LE Barts XT
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 840 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4200 MHz 4200 MHz
Unified Shaders 800 1120
Texture Mapping Units 40 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 150 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 134400 MB/sec 134400 MB/sec
Texel Rate 33600 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card 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 that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

3 Responses to “Radeon HD 6790 vs Radeon HD 6870”

[...] but the build I recomended has a much faster video card. For gaming the video card is paramount. Theoritical benchmark comparison between the 2 video cards based on specs The AMD 955 is still a heck of a [...]

[...] A graphics card that is two product cycles ahead (AMD Radeon 6870 vs the top end Mac option of the 6790); see here for a comparison of raw benchmarks from each card [...]

yoki says:

Dual-6790 or Single-6870??

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