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Radeon HD 4890 2GB vs Radeon HD 6790

Intro

The Radeon HD 4890 2GB uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory is set to run at a speed of 975 MHz on this particular model. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 6790, which features a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should be 8% quicker than the Radeon HD 4890 2GB overall, because of its higher data rate. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 9600 (8%)

Texel Rate

The Radeon HD 4890 2GB is just a bit (approximately 19%) better at texture filtering than the Radeon HD 6790. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 6400 (19%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4890 2GB is a better choice, though not by far. (explain)

Radeon HD 4890 2GB 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 2GB

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 2GB Radeon HD 6790
Manufacturer AMD AMD
Year Apr 2, 2009 April 2011
Code Name RV790 XT Barts LE
Memory 2048 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 max amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high 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 amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4890 2GB

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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