Radeon HD 6770 vs Radeon HD 7950 3GB

Intro

Compare all that to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this specific model. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 3GB should perform quite a bit faster than the Radeon HD 6770 overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 172800 (257%)

Texel Rate

The Radeon HD 7950 3GB should be a lot (about 149%) more effective at texture filtering than the Radeon HD 6770. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 53600 (149%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7950 3GB is a better choice, and very much so. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 6770		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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.