Geforce GTX 680 vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM runs at a speed of 1050 MHz on this card. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Geforce GTX 680		195 Watts
	Difference: 87 Watts (81%)

Memory Bandwidth

Theoretically, the Geforce GTX 680 should be much faster than the Radeon HD 6770 1GB in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 125056 (186%)

Texel Rate

The Geforce GTX 680 will be a lot (more or less 258%) more effective at texture filtering than the Radeon HD 6770 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 92768 (258%)

Pixel Rate

The Geforce GTX 680 is a lot (approximately 124%) more effective at anti-aliasing than the Radeon HD 6770 1GB, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 17792 (124%)

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 max amount of data (measured in MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.