Geforce GTX 680 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which makes use of 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 particular model. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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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

In theory, the Geforce GTX 680 should perform quite a bit 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 is much (more or less 258%) more effective at AF 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 should be quite a bit (more or less 124%) more effective at FSAA than the Radeon HD 6770 1GB, and should be capable of handling higher 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 (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 amount of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.