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Radeon HD 4830 512MB vs Radeon HD 4850 2GB

Intro

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

Compare that to the Radeon HD 4850 2GB, which features a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, 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 2GB 110 Watts
Difference: 15 Watts (16%)

Memory Bandwidth

The Radeon HD 4850 2GB, in theory, should perform a little bit faster than the Radeon HD 4830 512MB in general. (explain)

Radeon HD 4850 2GB 63552 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 5952 (10%)

Texel Rate

The Radeon HD 4850 2GB should be quite a bit (approximately 36%) better at AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 6600 (36%)

Pixel Rate

The Radeon HD 4850 2GB should be a little bit (about 9%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 512MB, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 4850 2GB 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

Check prices at:

Radeon HD 4850 2GB

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 2GB
Manufacturer AMD AMD
Year Oct 21, 2008 Jun 25, 2008
Code Name RV770 LE RV770 PRO
Memory 512 MB 2048 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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. 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 is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4830 512MB

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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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