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Radeon HD 4830 512MB vs Radeon HD 4850 X2 1GB

Intro

The Radeon HD 4830 512MB features a core clock frequency of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 4850 X2 1GB, which comes with GPU core speed of 625 MHz, and 1024 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB 95 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 155 Watts (163%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB is 121% quicker than the Radeon HD 4830 512MB in general, due to its greater bandwidth. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4830 512MB 57600 MB/sec
Difference: 69504 (121%)

Texel Rate

The Radeon HD 4850 X2 1GB should be quite a bit (about 172%) faster with regards to AF than the Radeon HD 4830 512MB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 31600 (172%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4850 X2 1GB is a better choice, and very much so. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 10800 (117%)

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 4830 512MB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 4830 512MB Radeon HD 4850 X2 1GB
Manufacturer AMD AMD
Year Oct 21, 2008 Nov 7, 2008
Code Name RV770 LE R700
Memory 512 MB 1024 MB (x2)
Core Speed 575 MHz 625 MHz (x2)
Memory Speed 1800 MHz 1986 MHz (x2)
Power (Max TDP) 95 watts 250 watts
Bandwidth 57600 MB/sec 127104 MB/sec
Texel Rate 18400 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 9200 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5) (x2)
Texture Mapping Units 32 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card 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 Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4830 512MB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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