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Radeon HD 4830 512MB vs Radeon HD 4850 512MB

Intro

The Radeon HD 4830 512MB uses a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 4850 512MB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 RAM runs at a frequency of 993 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically, the Radeon HD 4850 512MB should perform a small bit faster than the Radeon HD 4830 512MB in general. (explain)

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

Texel Rate

The Radeon HD 4850 512MB is a lot (approximately 36%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4850 512MB is a better choice, not by a very large margin though. (explain)

Radeon HD 4850 512MB 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 512MB

Amazon.com

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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 512MB
Manufacturer AMD AMD
Year Oct 21, 2008 Jun 25, 2008
Code Name RV770 LE RV770 PRO
Memory 512 MB 512 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 GDDR3
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 max amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the 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 number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4830 512MB

Amazon.com

Check prices at:

Radeon HD 4850 512MB

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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