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Radeon HD 3870 X2 1GB vs Radeon HD 7850

Intro

The Radeon HD 3870 X2 1GB uses a 55 nm design. AMD has clocked the core speed at 825 MHz. The GDDR4 RAM runs at a speed of 1126 MHz on this card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare that to the Radeon HD 7850, which comes with core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 will be 7% quicker than the Radeon HD 3870 X2 1GB overall, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7850 should be a lot (about 108%) better at anisotropic 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 a high screen resolution 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

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.

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 information (in units of megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video 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 graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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