Radeon HD 6770 1GB vs Radeon HD 6970

Intro

Compare those specs to the Radeon HD 6970, which has GPU core speed of 880 MHz, and 2048 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon HD 6970		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6970 should be 162% quicker than the Radeon HD 6770 1GB in general, due to its greater data rate. (explain)

Radeon HD 6970		176000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 108800 (162%)

Texel Rate

The Radeon HD 6970 will be much (more or less 135%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 48480 (135%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6970 is a better choice, by far. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 13760 (96%)

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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's 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 rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.