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Radeon HD 6750 vs Radeon HD 7970

Intro

The Radeon HD 6750 comes with core 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 ROPs.

Compare those specs to the Radeon HD 7970, which has GPU clock speed of 925 MHz, and 3072 MB of GDDR5 RAM set to run at 1375 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 86 Watts
Radeon HD 7970 250 Watts
Difference: 164 Watts (191%)

Memory Bandwidth

The Radeon HD 7970, in theory, should be quite a bit faster than the Radeon HD 6750 in general. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 6750 64000 MB/sec
Difference: 200000 (313%)

Texel Rate

The Radeon HD 7970 is quite a bit (about 354%) better at texture filtering than the Radeon HD 6750. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 6750 26100 Mtexels/sec
Difference: 92300 (354%)

Pixel Rate

The Radeon HD 7970 should be much (more or less 155%) faster with regards to FSAA than the Radeon HD 6750, and also will be able to handle higher resolutions better. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 18000 (155%)

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 6750

Amazon.com

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Radeon HD 7970

Amazon.com

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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 6750 Radeon HD 7970
Manufacturer AMD AMD
Year January 2011 January 2012
Code Name Juniper Pro Tahiti XT
Memory 512 MB 3072 MB
Core Speed 725 MHz 925 MHz
Memory Speed 4000 MHz 5500 MHz
Power (Max TDP) 86 watts 250 watts
Bandwidth 64000 MB/sec 264000 MB/sec
Texel Rate 26100 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 720 2048
Texture Mapping Units 36 128
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 1040 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 output rate also depends on many other factors, especially 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 6750

Amazon.com

Check prices at:

Radeon HD 7970

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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