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Radeon HD 6790 vs Radeon HD 6870

Intro

The Radeon HD 6790 has core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this particular card. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

(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 the exact same memory bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 6870 should be much (about 50%) better at AF 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 will be a lot (about 114%) better at anti-aliasing than the Radeon HD 6790, and also should be capable of handling higher screen 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

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

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 1050 MHz (4200 MHz effective) 1050 MHz (4200 MHz effective)
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: Bandwidth is the max amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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