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Radeon HD 3870 X2 512MB vs Radeon HD 4830 512MB

Intro

The Radeon HD 3870 X2 512MB features a clock frequency of 825 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR3 memory runs at a frequency of 900 MHz on this specific model. 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 3870 X2 512MB should theoretically be a lot faster than the Radeon HD 4830 512MB in general. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 57600 (100%)

Texel Rate

The Radeon HD 3870 X2 512MB should be much (about 43%) faster with regards to AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 8000 (43%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 X2 512MB is a better choice, and very much so. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 17200 (187%)

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 3870 X2 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 3870 X2 512MB Radeon HD 4830 512MB
Manufacturer AMD AMD
Year Jan 28, 2008 Oct 21, 2008
Code Name R680 RV770 LE
Memory 512 MB (x2) 512 MB
Core Speed 825 MHz (x2) 575 MHz
Memory Speed 1800 MHz (x2) 1800 MHz
Power (Max TDP) (Unknown) watts 95 watts
Bandwidth 115200 MB/sec 57600 MB/sec
Texel Rate 26400 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 26400 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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can 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 Render Output Units 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 many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 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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