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Radeon HD 6750 1GB vs Radeon HD 7950

Intro

The Radeon HD 6750 1GB has core speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 7950, which makes use of a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this model. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB 86 Watts
Radeon HD 7950 200 Watts
Difference: 114 Watts (133%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 should perform a lot faster than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 6750 1GB 64000 MB/sec
Difference: 176000 (275%)

Texel Rate

The Radeon HD 7950 is quite a bit (approximately 243%) more effective at texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 6750 1GB 26100 Mtexels/sec
Difference: 63500 (243%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7950 is the winner, by a large margin. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon HD 6750 1GB 11600 Mpixels/sec
Difference: 14000 (121%)

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 1GB

Amazon.com

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Radeon HD 7950

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 1GB Radeon HD 7950
Manufacturer AMD AMD
Year January 2011 January 2012
Code Name Juniper Pro Tahiti Pro
Memory 1024 MB 1536 MB
Core Speed 725 MHz 800 MHz
Memory Speed 4000 MHz 5000 MHz
Power (Max TDP) 86 watts 200 watts
Bandwidth 64000 MB/sec 240000 MB/sec
Texel Rate 26100 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 720 1792
Texture Mapping Units 36 112
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 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 6750 1GB

Amazon.com

Check prices at:

Radeon HD 7950

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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