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Radeon HD 3850 X2 vs Radeon HD 4830 1GB

Intro

The Radeon HD 3850 X2 has a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also makes use of 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 Raster Operation Units.

Compare that to the Radeon HD 4830 1GB, which comes with core speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3850 X2 will be 84% faster than the Radeon HD 4830 1GB in general, because of its greater bandwidth. (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 bit (more or less 16%) more effective at anisotropic 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

If using a high screen resolution is important to you, then the Radeon HD 3850 X2 is superior to the Radeon HD 4830 1GB, and very much so. (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

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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: Bandwidth is the largest amount of information (measured in MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably 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

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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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