Radeon HD 6770 1GB vs Radeon HD 7950

Intro

Compare all that to the Radeon HD 7950, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific model. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator 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

The Radeon HD 7950, in theory, should be quite a bit faster than the Radeon HD 6770 1GB overall. (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 (approximately 149%) more effective at texture filtering 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 (approximately 78%) better at FSAA than the Radeon HD 6770 1GB, and 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 (counted in megabytes per second) that can be transferred across 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 type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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