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Radeon HD 4890 1GB vs Radeon HD 6950

Intro

The Radeon HD 4890 1GB features clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6950, which uses a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this specific model. It features 1408 SPUs along with 88 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB 190 Watts
Radeon HD 6950 200 Watts
Difference: 10 Watts (5%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 should perform much faster than the Radeon HD 4890 1GB in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 35200 (28%)

Texel Rate

The Radeon HD 6950 should be a lot (about 76%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 30400 (76%)

Pixel Rate

The Radeon HD 6950 will be quite a bit (about 60%) better at full screen anti-aliasing than the Radeon HD 4890 1GB, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 4890 1GB 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 1GB

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 1GB Radeon HD 6950
Manufacturer AMD AMD
Year Apr 2, 2009 December 2010
Code Name RV790 XT Cayman Pro
Memory 1024 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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be 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 the texel rate, the better the video 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 that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4890 1GB

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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