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Radeon HD 4790 vs Radeon HD 4870 X2

Intro

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

Compare all of that to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory works at a frequency of 900 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should in theory be much better than the Radeon HD 4790 overall. (explain)

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

Texel Rate

The Radeon HD 4870 X2 will be a lot (more or less 213%) more effective at texture 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

If using high levels of AA is important to you, then the Radeon HD 4870 X2 is superior to the Radeon HD 4790, and very much so. (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 maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 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 high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per 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 better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs 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 many other factors, especially the memory bandwidth of the card - the lower the memory 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 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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