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Radeon HD 4790 vs Radeon HD 4870 X2

Intro

The Radeon HD 4790 features clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 4870 X2, which has core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should theoretically be a lot better than the Radeon HD 4790 in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 128000 (125%)

Texel Rate

The Radeon HD 4870 X2 should be quite a bit (about 213%) better at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 40800 (213%)

Pixel Rate

The Radeon HD 4870 X2 is a lot (about 150%) faster with regards to full screen anti-aliasing than the Radeon HD 4790, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 14400 (150%)

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 4870 X2

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 4870 X2
Manufacturer AMD AMD
Year 2009 Aug 12, 2008
Code Name RV790 R700
Memory 512 MB 1024 MB (x2)
Core Speed 600 MHz 750 MHz (x2)
Memory Speed 3200 MHz 3600 MHz (x2)
Power (Max TDP) (Unknown) watts 350 watts
Bandwidth 102400 MB/sec 230400 MB/sec
Texel Rate 19200 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5) (x2)
Texture Mapping Units 32 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR5
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 max amount of information (counted in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 maximum number of pixels the graphics card can possibly write to the 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 card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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