Radeon HD 6770 1GB vs Radeon HD 6950 2GB

Intro

Compare all that to the Radeon HD 6950 2GB, which comes with GPU clock speed of 800 MHz, and 2048 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is comprised 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 1GB		108 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 2GB should be a lot faster than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 92800 (138%)

Texel Rate

The Radeon HD 6950 2GB will be a lot (approximately 96%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 34400 (96%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6950 2GB is superior to the Radeon HD 6770 1GB, by a large margin. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 6770 1GB		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 (counted in megabytes per second) that can be transported across the external memory interface within a 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 once again. If DDR5, multiply by ANOTHER 2x. The better 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 processed 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.