GeForce GTX 580 3GB vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which uses a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this specific model. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the GeForce GTX 580 3GB should in theory be quite a bit superior to the Radeon HD 6770 overall. (explain)

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

Texel Rate

The GeForce GTX 580 3GB is a lot (more or less 37%) better at texture filtering than the Radeon HD 6770. (explain)

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

Pixel Rate

The GeForce GTX 580 3GB is a lot (about 157%) more effective at AA than the Radeon HD 6770, and also will be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon HD 6770		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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 number of 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 clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.