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Radeon HD 5870 vs Radeon HD 6750 1GB

Intro

The Radeon HD 5870 features a GPU clock speed of 850 MHz, and the 1024 MB of GDDR5 memory runs at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has set the core frequency at 725 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this specific model. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 5870 188 Watts
Difference: 102 Watts (119%)

Memory Bandwidth

Performance-wise, the Radeon HD 5870 should theoretically be much superior to the Radeon HD 6750 1GB in general. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 89600 (140%)

Texel Rate

The Radeon HD 5870 is a lot (approximately 161%) faster with regards to anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 41900 (161%)

Pixel Rate

The Radeon HD 5870 will be quite a bit (approximately 134%) more effective at FSAA than the Radeon HD 6750 1GB, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 15600 (134%)

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.

Price Comparison

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Radeon HD 5870

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 5870 Radeon HD 6750 1GB
Manufacturer AMD AMD
Year September 23, 2009 January 2011
Code Name Cypress XT Juniper Pro
Memory 1024 MB 1024 MB
Core Speed 850 MHz 725 MHz
Memory Speed 4800 MHz 4000 MHz
Power (Max TDP) 188 watts 86 watts
Bandwidth 153600 MB/sec 64000 MB/sec
Texel Rate 68000 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 1600(320x5) 720
Texture Mapping Units 80 36
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 2154 million 1040 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 processed per second. This is worked out by multiplying the total texture units 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 processed per 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 calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 5870

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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