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Radeon HD 4830 1GB vs Radeon HD 4850 2GB

Intro

The Radeon HD 4830 1GB comes with clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 4850 2GB, which features GPU core speed of 625 MHz, and 2048 MB of GDDR4 memory set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, 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 2GB 110 Watts
Difference: 15 Watts (16%)

Memory Bandwidth

The Radeon HD 4850 2GB should in theory perform a bit faster than the Radeon HD 4830 1GB in general. (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 (more or less 36%) better at anisotropic 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

If using a high resolution is important to you, then the Radeon HD 4850 2GB is a better choice, though not by far. (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 maximum amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher 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 amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum 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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