GeForce GTX 580 3GB vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this model. It features 720 SPUs along with 36 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 158 Watts (184%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 3GB should be 201% faster than the Radeon HD 6750 1GB overall, because of its higher data rate. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 128384 (201%)

Texel Rate

The GeForce GTX 580 3GB is much (about 89%) more effective at texture filtering than the Radeon HD 6750 1GB. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 23308 (89%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 580 3GB is superior to the Radeon HD 6750 1GB, by far. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 25456 (219%)

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 maximum amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.