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Radeon HD 3870 X2 1GB vs Radeon HD 6750

Intro

The Radeon HD 3870 X2 1GB has a GPU 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 features 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6750, which has core clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 720 SPUs as well as 36 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 X2 1GB, in theory, should be quite a bit faster than the Radeon HD 6750 overall. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon HD 6750 64000 MB/sec
Difference: 80128 (125%)

Texel Rate

The Radeon HD 3870 X2 1GB should be a small bit (more or less 1%) more effective at AF than the Radeon HD 6750. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Radeon HD 6750 26100 Mtexels/sec
Difference: 300 (1%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 3870 X2 1GB is a better choice, by a large margin. (explain)

Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 14800 (128%)

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 6750

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 6750
Manufacturer AMD AMD
Year Jan 28, 2008 January 2011
Code Name R680 Juniper Pro
Memory 1024 MB (x2) 512 MB
Core Speed 825 MHz (x2) 725 MHz
Memory Speed 2252 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 86 watts
Bandwidth 144128 MB/sec 64000 MB/sec
Texel Rate 26400 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) (x2) 720
Texture Mapping Units 16 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better 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 that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

Amazon.com

Check prices at:

Radeon HD 6750

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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