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Radeon HD 4890 2GB vs Radeon HD 6950

Intro

The Radeon HD 4890 2GB has core speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6950, which makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this model. It features 1408 SPUs as well as 88 TAUs 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 200 Watts
Difference: 10 Watts (5%)

Memory Bandwidth

In theory, the Radeon HD 6950 is 28% quicker than the Radeon HD 4890 2GB in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 6950 should be a lot (about 76%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6950 is the winner, by far. (explain)

Radeon HD 6950 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

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
Manufacturer AMD AMD
Year Apr 2, 2009 December 2010
Code Name RV790 XT Cayman Pro
Memory 2048 MB 1024 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 (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4890 2GB

Amazon.com

Check prices at:

Radeon HD 6950

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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