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Radeon HD 4750 vs Radeon HD 4830 1GB

Intro

The Radeon HD 4750 features a clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 4830 1GB, which comes with clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 Texture Address Units 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

Performance-wise, the Radeon HD 4830 1GB should in theory be a little bit superior to the Radeon HD 4750 overall. (explain)

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

Texel Rate

The Radeon HD 4750 should be quite a bit (approximately 27%) faster with regards to texture 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

The Radeon HD 4750 will be a lot (about 27%) faster with regards to AA than the Radeon HD 4830 1GB, and also able to handle higher resolutions while still performing well. (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 max amount of data (counted in MB per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out 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 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 record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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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.

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