Radeon HD 6770 1GB vs Radeon HD 6950

Intro

Compare that to the Radeon HD 6950, which makes use of a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this model. It features 1408 SPUs along with 88 TAUs 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 6950		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 is 138% faster than the Radeon HD 6770 1GB overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 6950 is a lot (about 96%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

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

Pixel Rate

The Radeon HD 6950 is quite a bit (more or less 78%) more effective at anti-aliasing than the Radeon HD 6770 1GB, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6950		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 max amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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