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Radeon HD 4830 512MB vs Radeon HD 4850 1GB

Intro

The Radeon HD 4830 512MB comes with a core clock frequency of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 4850 1GB, which has a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 15 Watts (16%)

Memory Bandwidth

In theory, the Radeon HD 4850 1GB should be a small bit faster than the Radeon HD 4830 512MB overall. (explain)

Radeon HD 4850 1GB 63552 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 5952 (10%)

Texel Rate

The Radeon HD 4850 1GB should be quite a bit (more or less 36%) more effective at AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 6600 (36%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4850 1GB is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 4850 1GB 10000 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 800 (9%)

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 4830 512MB

Amazon.com

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Radeon HD 4850 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 4830 512MB Radeon HD 4850 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 Jun 25, 2008
Code Name RV770 LE RV770 PRO
Memory 512 MB 1024 MB
Core Speed 575 MHz 625 MHz
Memory Speed 1800 MHz 1986 MHz
Power (Max TDP) 95 watts 110 watts
Bandwidth 57600 MB/sec 63552 MB/sec
Texel Rate 18400 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 956 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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 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 processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - 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 4830 512MB

Amazon.com

Check prices at:

Radeon HD 4850 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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