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Radeon HD 3850 512MB vs Radeon HD 4830 1GB

Intro

The Radeon HD 3850 512MB comes with clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 4830 1GB, which features GPU core speed of 575 MHz, and 1024 MB of GDDR4 RAM running at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 20 Watts (27%)

Memory Bandwidth

The Radeon HD 4830 1GB should theoretically be a bit faster than the Radeon HD 3850 512MB overall. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 4608 (9%)

Texel Rate

The Radeon HD 4830 1GB is much (approximately 72%) more effective at anisotropic filtering than the Radeon HD 3850 512MB. (explain)

Radeon HD 4830 1GB 18400 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 7712 (72%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 3850 512MB is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 3850 512MB 10688 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 1488 (16%)

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 3850 512MB

Amazon.com

Check prices at:

Radeon HD 4830 1GB

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 3850 512MB Radeon HD 4830 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 512 MB 1024 MB
Core Speed 668 MHz 575 MHz
Memory Speed 1656 MHz 1800 MHz
Power (Max TDP) 75 watts 95 watts
Bandwidth 52992 MB/sec 57600 MB/sec
Texel Rate 10688 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
Render Output Units 16 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 x16/AGP 8x 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 (measured in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon HD 4830 1GB

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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