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Radeon HD 6790 vs Radeon HD 6870

Intro

The Radeon HD 6790 has a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6870, which uses a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this specific card. It features 1120 SPUs along with 56 Texture Address Units and 32 Rasterization Operator Units.

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 perform the same. (explain)

Texel Rate

The Radeon HD 6870 should be quite a bit (approximately 50%) faster with regards to texture 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 should be quite a bit (more or less 114%) faster with regards to anti-aliasing than the Radeon HD 6790, and capable of handling higher resolutions while still performing well. (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

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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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max 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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