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Radeon HD 4890 1GB vs Radeon HD 6790

Intro

The Radeon HD 4890 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 975 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6790, which comes with GPU core speed of 840 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

The Radeon HD 6790 should in theory perform a bit faster than the Radeon HD 4890 1GB overall. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 4890 1GB should be a bit (approximately 19%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 6400 (19%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4890 1GB is a better choice, but only just. (explain)

Radeon HD 4890 1GB 16000 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 2560 (19%)

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 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6790

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 4890 1GB Radeon HD 6790
Manufacturer AMD AMD
Year Apr 2, 2009 April 2011
Code Name RV790 XT Barts LE
Memory 1024 MB 1024 MB
Core Speed 1000 MHz 840 MHz
Memory Speed 3900 MHz 4200 MHz
Power (Max TDP) 190 watts 150 watts
Bandwidth 124800 MB/sec 134400 MB/sec
Texel Rate 40000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 800(160x5) 800
Texture Mapping Units 40 40
Render Output Units 16 16
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 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6790

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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