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Radeon HD 3870 X2 1GB vs Radeon HD 6790

Intro

The Radeon HD 3870 X2 1GB has a GPU core speed of 825 MHz, and the 1024 MB of GDDR4 RAM is set to run at 1126 MHz through a 256-bit bus. It also is made up of 320(64x5) Stream Processors, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this card. It features 800 SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 3870 X2 1GB should perform a little bit faster than the Radeon HD 6790 in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 9728 (7%)

Texel Rate

The Radeon HD 6790 is much (approximately 27%) better at anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 7200 (27%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 3870 X2 1GB is the winner, by far. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 12960 (96%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

Check prices at:

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 3870 X2 1GB Radeon HD 6790
Manufacturer AMD AMD
Year Jan 28, 2008 April 2011
Code Name R680 Barts LE
Memory 1024 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 840 MHz
Memory Speed 2252 MHz (x2) 4200 MHz
Power (Max TDP) (Unknown) watts 150 watts
Bandwidth 144128 MB/sec 134400 MB/sec
Texel Rate 26400 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 320(64x5) (x2) 800
Texture Mapping Units 16 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1700 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

Check prices at:

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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