Radeon HD 6770 vs Radeon HD 6950 2GB

Intro

Compare all of that to the Radeon HD 6950 2GB, which comes with GPU core speed of 800 MHz, and 2048 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 1408 Stream Processors, 88 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 2GB should perform much faster than the Radeon HD 6770 in general. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 92800 (138%)

Texel Rate

The Radeon HD 6950 2GB should be a lot (about 96%) more effective at texture filtering than the Radeon HD 6770. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 34400 (96%)

Pixel Rate

The Radeon HD 6950 2GB is quite a bit (approximately 78%) better at full screen anti-aliasing than the Radeon HD 6770, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 11200 (78%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result 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 amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.