Radeon HD 6770 1GB vs Radeon HD 6970

Intro

Compare that to the Radeon HD 6970, which features clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 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 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 6970 is quite a bit (more or less 135%) better at AF 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 using a high resolution is important to you, then the Radeon HD 6970 is superior to the Radeon HD 6770 1GB, by a large margin. (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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling 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 the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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.