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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 frequency at 825 MHz. The GDDR4 RAM works at a speed of 1126 MHz on this model. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core speed at 860 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this particular model. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 7850 is 7% faster than the Radeon HD 3870 X2 1GB in general, because of its greater bandwidth. (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 quite a bit (approximately 108%) more effective 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

The Radeon HD 7850 should be just a bit (approximately 4%) better at anti-aliasing than the Radeon HD 3870 X2 1GB, and also should be capable of handling higher resolutions better. (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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are applied per second. This figure 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max 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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