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Radeon HD 3850 256MB vs Radeon HD 4830 512MB

Intro

The Radeon HD 3850 256MB features a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 4830 512MB, which has a core clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 4830 512MB 95 Watts
Difference: 20 Watts (27%)

Memory Bandwidth

The Radeon HD 4830 512MB should in theory be a little bit faster than the Radeon HD 3850 256MB in general. (explain)

Radeon HD 4830 512MB 57600 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 4608 (9%)

Texel Rate

The Radeon HD 4830 512MB should be a lot (more or less 72%) better at anisotropic filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 4830 512MB 18400 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 7712 (72%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 256MB is the winner, not by a very large margin though. (explain)

Radeon HD 3850 256MB 10688 Mpixels/sec
Radeon HD 4830 512MB 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 256MB

Amazon.com

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Radeon HD 4830 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.

Specifications

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Model Radeon HD 3850 256MB Radeon HD 4830 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 256 MB 512 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 GDDR3
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 max amount of information (counted in MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon HD 4830 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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