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Radeon HD 4830 1GB vs Radeon HD 4850 512MB

Intro

The Radeon HD 4830 1GB comes with a GPU core clock speed of 575 MHz, and the 1024 MB of GDDR4 RAM runs at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4850 512MB, which uses a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 RAM runs at a frequency of 993 MHz on this particular card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 4850 512MB will be 10% quicker than the Radeon HD 4830 1GB in general, because of its higher data rate. (explain)

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

Texel Rate

The Radeon HD 4850 512MB should be a lot (about 36%) better at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4850 512MB is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 4850 512MB 10000 Mpixels/sec
Radeon HD 4830 1GB 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 1GB

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 1GB Radeon HD 4850 512MB
Manufacturer AMD AMD
Year Oct 21, 2008 Jun 25, 2008
Code Name RV770 LE RV770 PRO
Memory 1024 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 GDDR4 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 maximum amount of data (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units 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 in one 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. Pixel rate is calculated by multiplying the number of colour ROPs by the the core 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 is also dependant on quite a few 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 4830 1GB

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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