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Radeon HD 6950 2GB vs Radeon HD 7990

Intro

The Radeon HD 6950 2GB has clock speeds of 800 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1408 SPUs as well as 88 Texture Address Units and 32 ROPs.

Compare all that to the Radeon HD 7990, which features core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6950 2GB 200 Watts
Radeon HD 7990 375 Watts
Difference: 175 Watts (88%)

Memory Bandwidth

The Radeon HD 7990 should in theory be a lot faster than the Radeon HD 6950 2GB overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 416000 (260%)

Texel Rate

The Radeon HD 7990 will be much (about 245%) more effective at AF than the Radeon HD 6950 2GB. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 172800 (245%)

Pixel Rate

The Radeon HD 7990 is quite a bit (about 138%) faster with regards to full screen anti-aliasing than the Radeon HD 6950 2GB, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 6950 2GB 25600 Mpixels/sec
Difference: 35200 (138%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon HD 7990

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 6950 2GB Radeon HD 7990
Manufacturer AMD AMD
Year December 2010 April 2013
Code Name Cayman Pro Malta
Memory 2048 MB 3072 MB (x2)
Core Speed 800 MHz 950 MHz (x2)
Memory Speed 5000 MHz 6000 MHz (x2)
Power (Max TDP) 200 watts 375 watts
Bandwidth 160000 MB/sec 576000 MB/sec
Texel Rate 70400 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1408 2048 (x2)
Texture Mapping Units 88 128 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon HD 7990

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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