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Radeon HD 3870 X2 1GB vs Radeon HD 6790

Intro

The Radeon HD 3870 X2 1GB has core speeds of 825 MHz on the GPU, and 1126 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6790, which makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this model. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 1GB should theoretically be just a 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 will be a lot (about 27%) faster with regards to AF 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

The Radeon HD 3870 X2 1GB should be much (about 96%) faster with regards to FSAA than the Radeon HD 6790, and able to handle higher screen resolutions without slowing down too much. (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

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Radeon HD 6790

Amazon.com

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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 (in units of MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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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.

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