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Radeon HD 4750 vs Radeon HD 4830 1GB

Intro

The Radeon HD 4750 comes with a GPU core clock speed of 730 MHz, and the 512 MB of GDDR5 memory runs at 800 MHz through a 128-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 4830 1GB, which comes with a core clock frequency of 575 MHz and a GDDR4 memory speed of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 20 Watts (27%)

Memory Bandwidth

In theory, the Radeon HD 4830 1GB will be 13% quicker than the Radeon HD 4750 in general, due to its greater bandwidth. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4750 will be quite a bit (more or less 27%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 4960 (27%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4750 is superior to the Radeon HD 4830 1GB, by a large margin. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 2480 (27%)

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 4830 1GB

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 4830 1GB
Manufacturer AMD AMD
Year Oct 21, 2008
Code Name RV740 RV770 LE
Memory 512 MB 1024 MB
Core Speed 730 MHz 575 MHz
Memory Speed 3200 MHz 1800 MHz
Power (Max TDP) 75 watts 95 watts
Bandwidth 51200 MB/sec 57600 MB/sec
Texel Rate 23360 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 11680 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 640(128x5) 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 826 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably 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 4830 1GB

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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