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Radeon HD 4790 vs Radeon HD 4850 X2 512MB

Intro

The Radeon HD 4790 comes with a GPU core speed of 600 MHz, and the 512 MB of GDDR5 memory runs at 800 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4850 X2 512MB, which features clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4850 X2 512MB should perform quite a bit faster than the Radeon HD 4790 overall. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 24704 (24%)

Texel Rate

The Radeon HD 4850 X2 512MB will be much (about 160%) more effective at texture filtering than the Radeon HD 4790. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 30800 (160%)

Pixel Rate

The Radeon HD 4850 X2 512MB should be a lot (more or less 108%) more effective at anti-aliasing than the Radeon HD 4790, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 10400 (108%)

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 4790

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 4790 Radeon HD 4850 X2 512MB
Manufacturer AMD AMD
Year 2009 Nov 7, 2008
Code Name RV790 R700
Memory 512 MB 512 MB (x2)
Core Speed 600 MHz 625 MHz (x2)
Memory Speed 3200 MHz 1986 MHz (x2)
Power (Max TDP) (Unknown) watts 250 watts
Bandwidth 102400 MB/sec 127104 MB/sec
Texel Rate 19200 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 9600 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 GDDR5 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 959 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 (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4790

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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