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Radeon HD 4750 vs Radeon HD 6970

Intro

The Radeon HD 4750 features a GPU core clock speed of 730 MHz, and the 512 MB of GDDR5 RAM runs at 800 MHz through a 128-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6970, which has core speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon HD 6970 250 Watts
Difference: 175 Watts (233%)

Memory Bandwidth

The Radeon HD 6970, in theory, should perform quite a bit faster than the Radeon HD 4750 in general. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 124800 (244%)

Texel Rate

The Radeon HD 6970 will be quite a bit (approximately 262%) faster with regards to AF than the Radeon HD 4750. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 61120 (262%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6970 is the winner, by a large margin. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 16480 (141%)

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 4750

Amazon.com

Check prices at:

Radeon HD 6970

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 4750 Radeon HD 6970
Manufacturer AMD AMD
Year December 2010
Code Name RV740 Cayman XT
Memory 512 MB 2048 MB
Core Speed 730 MHz 880 MHz
Memory Speed 3200 MHz 5500 MHz
Power (Max TDP) 75 watts 250 watts
Bandwidth 51200 MB/sec 176000 MB/sec
Texel Rate 23360 Mtexels/sec 84480 Mtexels/sec
Pixel Rate 11680 Mpixels/sec 28160 Mpixels/sec
Unified Shaders 640(128x5) 1536
Texture Mapping Units 32 96
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 826 million 2640 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number 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 outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4750

Amazon.com

Check prices at:

Radeon HD 6970

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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