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Radeon HD 4790 vs Radeon HD 4850 X2 1GB

Intro

The Radeon HD 4790 features a core clock frequency of 600 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 4850 X2 1GB, which comes with GPU core speed of 625 MHz, and 1024 MB of GDDR3 memory running 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

Memory Bandwidth

Performance-wise, the Radeon HD 4850 X2 1GB should in theory be quite a bit better than the Radeon HD 4790 in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 24704 (24%)

Texel Rate

The Radeon HD 4850 X2 1GB will be much (more or less 160%) more effective at AF than the Radeon HD 4790. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 30800 (160%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4850 X2 1GB is the winner, and very much so. (explain)

Radeon HD 4850 X2 1GB 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 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 4790 Radeon HD 4850 X2 1GB
Manufacturer AMD AMD
Year 2009 Nov 7, 2008
Code Name RV790 R700
Memory 512 MB 1024 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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4790

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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