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

Intro

The Radeon HD 4830 1GB has a clock frequency of 575 MHz and a GDDR4 memory speed of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4850 X2 512MB, which comes with GPU core speed of 625 MHz, and 512 MB of GDDR3 RAM set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should perform much faster than the Radeon HD 4830 1GB overall. (explain)

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

Texel Rate

The Radeon HD 4850 X2 512MB will be much (approximately 172%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

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

Pixel Rate

The Radeon HD 4850 X2 512MB is much (approximately 117%) more effective at FSAA than the Radeon HD 4830 1GB, and also capable of handling higher resolutions better. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 4830 1GB 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 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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 4830 1GB Radeon HD 4850 X2 512MB
Manufacturer AMD AMD
Year Oct 21, 2008 Nov 7, 2008
Code Name RV770 LE R700
Memory 1024 MB 512 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 GDDR4 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: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4830 1GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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