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Radeon HD 4790 vs Radeon HD 4870 512MB

Intro

The Radeon HD 4790 uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR5 memory works at a speed of 800 MHz on this specific model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4870 512MB, which has a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB will be 13% faster than the Radeon HD 4790 in general, due to its higher data rate. (explain)

Radeon HD 4870 512MB 115200 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 12800 (13%)

Texel Rate

The Radeon HD 4870 512MB should be much (about 56%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 4870 512MB 30000 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 10800 (56%)

Pixel Rate

The Radeon HD 4870 512MB will be quite a bit (more or less 25%) faster with regards to anti-aliasing than the Radeon HD 4790, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 4870 512MB 12000 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 2400 (25%)

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.

Price Comparison

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 4870 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 4870 512MB
Manufacturer AMD AMD
Year 2009 Jun 25, 2008
Code Name RV790 RV770 XT
Memory 512 MB 512 MB
Core Speed 600 MHz 750 MHz
Memory Speed 3200 MHz 3600 MHz
Power (Max TDP) (Unknown) watts 150 watts
Bandwidth 102400 MB/sec 115200 MB/sec
Texel Rate 19200 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 959 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - 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 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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