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Radeon HD 4890 2GB vs Radeon HD 6950 2GB

Intro

The Radeon HD 4890 2GB makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 975 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6950 2GB, which comes with a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 10 Watts (5%)

Memory Bandwidth

The Radeon HD 6950 2GB, in theory, should be much faster than the Radeon HD 4890 2GB overall. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 35200 (28%)

Texel Rate

The Radeon HD 6950 2GB will be much (about 76%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 30400 (76%)

Pixel Rate

The Radeon HD 6950 2GB should be quite a bit (about 60%) more effective at full screen anti-aliasing than the Radeon HD 4890 2GB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6950 2GB 25600 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 9600 (60%)

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 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 4890 2GB Radeon HD 6950 2GB
Manufacturer AMD AMD
Year Apr 2, 2009 December 2010
Code Name RV790 XT Cayman Pro
Memory 2048 MB 2048 MB
Core Speed 1000 MHz 800 MHz
Memory Speed 3900 MHz 5000 MHz
Power (Max TDP) 190 watts 200 watts
Bandwidth 124800 MB/sec 160000 MB/sec
Texel Rate 40000 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 800(160x5) 1408
Texture Mapping Units 40 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: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 can be applied in one second. This figure is calculated by multiplying the total texture units 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 maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 2GB

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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