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Radeon HD 3850 512MB vs Radeon HD 4830 512MB

Intro

The Radeon HD 3850 512MB comes with core speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 4830 512MB, which has a core clock speed of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 512MB should theoretically be just a bit superior to the Radeon HD 3850 512MB overall. (explain)

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

Texel Rate

The Radeon HD 4830 512MB is much (about 72%) better at anisotropic filtering than the Radeon HD 3850 512MB. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 3850 512MB is the winner, but only just. (explain)

Radeon HD 3850 512MB 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 512MB

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.

Specifications

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Model Radeon HD 3850 512MB Radeon HD 4830 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 512 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 data (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

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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