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Radeon HD 3870 X2 512MB vs Radeon HD 6750 1GB

Intro

The Radeon HD 3870 X2 512MB features core speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6750 1GB, which has GPU clock speed of 725 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is comprised of 720 SPUs, 36 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 X2 512MB should theoretically be a lot better than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 51200 (80%)

Texel Rate

The Radeon HD 3870 X2 512MB should be a little bit (approximately 1%) better at texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 300 (1%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3870 X2 512MB is the winner, by far. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 6750 1GB 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 512MB

Amazon.com

Check prices at:

Radeon HD 6750 1GB

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 512MB Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Jan 28, 2008 January 2011
Code Name R680 Juniper Pro
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 725 MHz
Memory Speed 1800 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 86 watts
Bandwidth 115200 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 GDDR3 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 4.1

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6750 1GB

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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