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Radeon HD 4830 1GB vs Radeon HD 4850 2GB

Intro

The Radeon HD 4830 1GB uses a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR4 memory works at a frequency of 900 MHz on this card. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4850 2GB, which uses a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR4 memory works at a frequency of 993 MHz on this specific card. It features 800(160x5) SPUs along with 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 1GB 95 Watts
Radeon HD 4850 2GB 110 Watts
Difference: 15 Watts (16%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 2GB should perform just a bit faster than the Radeon HD 4830 1GB overall. (explain)

Radeon HD 4850 2GB 63552 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 5952 (10%)

Texel Rate

The Radeon HD 4850 2GB will be a lot (approximately 36%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 6600 (36%)

Pixel Rate

The Radeon HD 4850 2GB should be a little bit (approximately 9%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 2GB 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 2GB

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 2GB
Manufacturer AMD AMD
Year Oct 21, 2008 Jun 25, 2008
Code Name RV770 LE RV770 PRO
Memory 1024 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 GDDR4 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 max amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4830 1GB

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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