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Radeon HD 3870 X2 1GB vs Radeon HD 5850

Intro

The Radeon HD 3870 X2 1GB makes use of a 55 nm design. AMD has set the core frequency at 825 MHz. The GDDR4 memory works at a frequency of 1126 MHz on this particular card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 5850, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this particular card. It features 1440(288x5) SPUs along with 72 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 1GB is 13% quicker than the Radeon HD 5850 overall, because of its greater bandwidth. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon HD 5850 128000 MB/sec
Difference: 16128 (13%)

Texel Rate

The Radeon HD 5850 is much (approximately 98%) more effective at AF than the Radeon HD 3870 X2 1GB. (explain)

Radeon HD 5850 52200 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 25800 (98%)

Pixel Rate

The Radeon HD 3870 X2 1GB should be a small bit (about 14%) better at AA than the Radeon HD 5850, and also able to handle higher screen resolutions better. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon HD 5850 23200 Mpixels/sec
Difference: 3200 (14%)

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 5850

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 5850
Manufacturer AMD AMD
Year Jan 28, 2008 September 30, 2009
Code Name R680 Cypress PRO
Memory 1024 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 725 MHz
Memory Speed 2252 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 151 watts
Bandwidth 144128 MB/sec 128000 MB/sec
Texel Rate 26400 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 1440(288x5)
Texture Mapping Units 16 (x2) 72
Render Output Units 16 (x2) 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 2154 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 3.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 5850

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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