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Radeon HD 4750 vs Radeon HD 6750

Intro

The Radeon HD 4750 features core clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6750, which uses a 40 nm design. AMD has set the core frequency at 725 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this particular card. It features 720 SPUs as well as 36 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon HD 6750 86 Watts
Difference: 11 Watts (15%)

Memory Bandwidth

Theoretically, the Radeon HD 6750 should be a lot faster than the Radeon HD 4750 in general. (explain)

Radeon HD 6750 64000 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 should be a little bit (more or less 12%) better at texture filtering than the Radeon HD 4750. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 2740 (12%)

Pixel Rate

The Radeon HD 4750 will be just a bit (more or less 1%) more effective at FSAA than the Radeon HD 6750, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 80 (1%)

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 6750

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 6750
Manufacturer AMD AMD
Year January 2011
Code Name RV740 Juniper Pro
Memory 512 MB 512 MB
Core Speed 730 MHz 725 MHz
Memory Speed 3200 MHz 4000 MHz
Power (Max TDP) 75 watts 86 watts
Bandwidth 51200 MB/sec 64000 MB/sec
Texel Rate 23360 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 11680 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 640(128x5) 720
Texture Mapping Units 32 36
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 826 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.0

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4750

Amazon.com

Check prices at:

Radeon HD 6750

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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