GeForce GTX 580 3GB vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which comes with a clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 136 Watts (126%)

Memory Bandwidth

The GeForce GTX 580 3GB should in theory perform much faster than the Radeon HD 6770 1GB overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 125184 (186%)

Texel Rate

The GeForce GTX 580 3GB is quite a bit (approximately 37%) better at anisotropic filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 13408 (37%)

Pixel Rate

The GeForce GTX 580 3GB should be a lot (approximately 157%) better at AA than the Radeon HD 6770 1GB, and also will be able to handle higher screen resolutions better. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 22656 (157%)

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 largest amount of data (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.