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Radeon HD 4750 vs Radeon HD 6970

Intro

The Radeon HD 4750 features clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 6970, which comes with clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 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

As far as performance goes, the Radeon HD 6970 should theoretically be a lot superior to 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 is a lot (approximately 262%) more effective at texture filtering than the Radeon HD 4750. (explain)

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

Pixel Rate

The Radeon HD 6970 is quite a bit (more or less 141%) more effective at AA than the Radeon HD 4750, and will be able to handle higher screen resolutions while still performing well. (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 data (measured in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

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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