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Radeon HD 4790 vs Radeon HD 6850

Intro

The Radeon HD 4790 features core 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 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6850, which uses a 40 nm design. AMD has set the core frequency at 775 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this card. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 6850 is 25% faster than the Radeon HD 4790 in general, because of its greater data rate. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 25600 (25%)

Texel Rate

The Radeon HD 6850 is a lot (more or less 94%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 18000 (94%)

Pixel Rate

The Radeon HD 6850 will be much (approximately 158%) more effective at AA than the Radeon HD 4790, and should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 15200 (158%)

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 6850

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 6850
Manufacturer AMD AMD
Year 2009 October 2010
Code Name RV790 Barts Pro
Memory 512 MB 1024 MB
Core Speed 600 MHz 775 MHz
Memory Speed 3200 MHz 4000 MHz
Power (Max TDP) (Unknown) watts 127 watts
Bandwidth 102400 MB/sec 128000 MB/sec
Texel Rate 19200 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 640(128x5) 960
Texture Mapping Units 32 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 1700 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 largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the 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 6850

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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