Geforce GTX 680 vs Radeon HD 6770 1GB

Intro

Compare those specifications to the Radeon HD 6770 1GB, which has clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 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

The Geforce GTX 680 should in theory 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 will be a lot (approximately 258%) more effective at anisotropic 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 should be much (more or less 124%) more effective at full screen anti-aliasing than the Radeon HD 6770 1GB, and also capable of handling higher resolutions without slowing down too much. (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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.