GeForce GTX 580 vs Radeon HD 6750 1GB

Intro

Compare those specifications to the Radeon HD 6750 1GB, which comes with a core clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It features 720 SPUs, 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		244 Watts
	Difference: 158 Watts (184%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 is 201% faster than the Radeon HD 6750 1GB in general, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 580 will be quite a bit (approximately 89%) better at texture filtering than the Radeon HD 6750 1GB. (explain)

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

Pixel Rate

The GeForce GTX 580 is much (about 219%) better at full screen anti-aliasing than the Radeon HD 6750 1GB, and also will be capable of handling higher resolutions better. (explain)

GeForce GTX 580		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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant 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.