Radeon HD 6770 1GB vs Radeon HD 7950

Intro

Compare all of that to the Radeon HD 7950, which comes with a GPU core clock speed of 800 MHz, and 1536 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 112 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 7950		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

Performance-wise, the Radeon HD 7950 should theoretically be quite a bit better than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 7950		240000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 172800 (257%)

Texel Rate

The Radeon HD 7950 should be quite a bit (about 149%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 53600 (149%)

Pixel Rate

The Radeon HD 7950 is much (more or less 78%) better at AA than the Radeon HD 6770 1GB, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 7950		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 data (in units of MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 processed per second. This number is worked out by multiplying the total amount of texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.