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Radeon HD 3850 X2 vs Radeon HD 4830 512MB

Intro

The Radeon HD 3850 X2 comes with a core clock frequency of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare that to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this specific card. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2 should in theory be much faster than the Radeon HD 4830 512MB overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 48384 (84%)

Texel Rate

The Radeon HD 3850 X2 is a small bit (about 16%) faster with regards to anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 2976 (16%)

Pixel Rate

The Radeon HD 3850 X2 will be much (about 132%) better at AA than the Radeon HD 4830 512MB, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 4830 512MB 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 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 X2 Radeon HD 4830 512MB
Manufacturer AMD AMD
Year Apr 4, 2008 Oct 21, 2008
Code Name RV670 PRO RV770 LE
Memory 512 MB (x2) 512 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 GDDR3
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 data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the 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 most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 3850 X2

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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