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

Intro

The Radeon HD 3870 X2 512MB has a core clock frequency of 825 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has set the core speed at 725 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this specific card. It features 720 SPUs along with 36 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 3870 X2 512MB should be quite a bit faster 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 bit (about 1%) better at AF 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 a high screen resolution is important to you, then the Radeon HD 3870 X2 512MB is superior to the Radeon HD 6750 1GB, by a large margin. (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

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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: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max 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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