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Radeon HD 4790 vs Radeon HD 6950 2GB

Intro

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

Compare that to the Radeon HD 6950 2GB, which has core speeds of 800 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1408 SPUs as well as 88 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6950 2GB, in theory, should perform quite a bit faster than the Radeon HD 4790 in general. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 57600 (56%)

Texel Rate

The Radeon HD 6950 2GB should be a lot (more or less 267%) faster with regards to AF than the Radeon HD 4790. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 51200 (267%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6950 2GB is the winner, by a large margin. (explain)

Radeon HD 6950 2GB 25600 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 16000 (167%)

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 6950 2GB

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 6950 2GB
Manufacturer AMD AMD
Year 2009 December 2010
Code Name RV790 Cayman Pro
Memory 512 MB 2048 MB
Core Speed 600 MHz 800 MHz
Memory Speed 3200 MHz 5000 MHz
Power (Max TDP) (Unknown) watts 200 watts
Bandwidth 102400 MB/sec 160000 MB/sec
Texel Rate 19200 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 640(128x5) 1408
Texture Mapping Units 32 88
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 2640 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 6950 2GB

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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