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Radeon HD 4870 X2 vs Radeon HD 6750 1GB

Intro

The Radeon HD 4870 X2 comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6750 1GB, which comes with a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 720 Stream Processors, 36 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 4870 X2 350 Watts
Difference: 264 Watts (307%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory be a lot faster than the Radeon HD 6750 1GB in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 166400 (260%)

Texel Rate

The Radeon HD 4870 X2 should be quite a bit (approximately 130%) better at texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 33900 (130%)

Pixel Rate

The Radeon HD 4870 X2 will be much (more or less 107%) faster with regards to full screen anti-aliasing than the Radeon HD 6750 1GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 12400 (107%)

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 4870 X2

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 4870 X2 Radeon HD 6750 1GB
Manufacturer AMD AMD
Year Aug 12, 2008 January 2011
Code Name R700 Juniper Pro
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 725 MHz
Memory Speed 3600 MHz (x2) 4000 MHz
Power (Max TDP) 350 watts 86 watts
Bandwidth 230400 MB/sec 64000 MB/sec
Texel Rate 60000 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 800(160x5) (x2) 720
Texture Mapping Units 40 (x2) 36
Render Output Units 16 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4870 X2

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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