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Radeon HD 3850 X2 vs Radeon HD 4830 1GB

Intro

The Radeon HD 3850 X2 comes with a core clock speed of 668 MHz and a GDDR3 memory frequency 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 Raster Operation Units.

Compare all that to the Radeon HD 4830 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR4 memory works at a speed of 900 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2 should theoretically be much faster than the Radeon HD 4830 1GB in general. (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 is 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 resolution is important to you, then the Radeon HD 3850 X2 is a better choice, 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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core 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

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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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