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Radeon HD 3870 X2 1GB vs Radeon HD 7850

Intro

The Radeon HD 3870 X2 1GB has a GPU core clock 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 comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7850, which has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 7850 should be just a bit faster than the Radeon HD 3870 X2 1GB overall. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 3870 X2 1GB 144128 MB/sec
Difference: 9472 (7%)

Texel Rate

The Radeon HD 7850 will be quite a bit (about 108%) more effective at texture filtering than the Radeon HD 3870 X2 1GB. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 28640 (108%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is a better choice, but not by far. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Difference: 1120 (4%)

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 7850

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 7850
Manufacturer AMD AMD
Year Jan 28, 2008 March 2012
Code Name R680 Pitcairn Pro
Memory 1024 MB (x2) 2048 MB
Core Speed 825 MHz (x2) 860 MHz
Memory Speed 2252 MHz (x2) 4800 MHz
Power (Max TDP) (Unknown) watts 130 watts
Bandwidth 144128 MB/sec 153600 MB/sec
Texel Rate 26400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 320(64x5) (x2) 1024
Texture Mapping Units 16 (x2) 64
Render Output Units 16 (x2) 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million 2800 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many 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.

Display Prices

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Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 7850

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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