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Radeon HD 3850 X2 vs Radeon HD 4830 1GB

Intro

The Radeon HD 3850 X2 has a GPU core speed of 668 MHz, and the 512 MB of GDDR3 memory is set to run at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 Texture Address Units, and 16 Raster Operation Units.

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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 X2 will be 84% faster than the Radeon HD 4830 1GB in general, due to its higher data rate. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 4830 1GB 57600 MB/sec
Difference: 48384 (84%)

Texel Rate

The Radeon HD 3850 X2 should be a small bit (more or less 16%) better at texture filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 2976 (16%)

Pixel Rate

The Radeon HD 3850 X2 will be much (about 132%) faster with regards to AA than the Radeon HD 4830 1GB, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 12176 (132%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3850 X2

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 X2 Radeon HD 4830 1GB
Manufacturer AMD AMD
Year Apr 4, 2008 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 512 MB (x2) 1024 MB
Core Speed 668 MHz (x2) 575 MHz
Memory Speed 1656 MHz (x2) 1800 MHz
Power (Max TDP) (Unknown) watts 95 watts
Bandwidth 105984 MB/sec 57600 MB/sec
Texel Rate 21376 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 21376 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 640(128x5)
Texture Mapping Units 16 (x2) 32
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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

Display Prices

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Radeon HD 3850 X2

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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