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Radeon HD 4850 X2 512MB vs Radeon HD 5830

Intro

The Radeon HD 4850 X2 512MB has a GPU core speed of 625 MHz, and the 512 MB of GDDR3 RAM is set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 5830, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is made up of 1120(224x5) Stream Processors, 56 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5830 175 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 75 Watts (43%)

Memory Bandwidth

Theoretically, the Radeon HD 5830 should perform just a bit faster than the Radeon HD 4850 X2 512MB overall. (explain)

Radeon HD 5830 128000 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 896 (1%)

Texel Rate

The Radeon HD 4850 X2 512MB is just a bit (approximately 12%) better at texture filtering than the Radeon HD 5830. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 5830 44800 Mtexels/sec
Difference: 5200 (12%)

Pixel Rate

The Radeon HD 4850 X2 512MB should be quite a bit (approximately 56%) faster with regards to AA than the Radeon HD 5830, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 5830 12800 Mpixels/sec
Difference: 7200 (56%)

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 4850 X2 512MB

Amazon.com

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Radeon HD 5830

Amazon.com

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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 4850 X2 512MB Radeon HD 5830
Manufacturer AMD AMD
Year Nov 7, 2008 February 25, 2010
Code Name R700 Cypress LE
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 800 MHz
Memory Speed 1986 MHz (x2) 4000 MHz
Power (Max TDP) 250 watts 175 watts
Bandwidth 127104 MB/sec 128000 MB/sec
Texel Rate 50000 Mtexels/sec 44800 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1120(224x5)
Texture Mapping Units 40 (x2) 56
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 2154 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 5830

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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