Geforce GTX 680 vs Radeon HD 4550 256MB

Intro

Compare all of that to the Radeon HD 4550 256MB, which features a GPU core clock speed of 600 MHz, and 256 MB of DDR3 RAM running at 800 MHz through a 64-bit bus. It also is made up of 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Geforce GTX 680		195 Watts
	Difference: 170 Watts (680%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should be 1402% faster than the Radeon HD 4550 256MB overall, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 179456 (1402%)

Texel Rate

The Geforce GTX 680 will be a lot (more or less 2583%) faster with regards to AF than the Radeon HD 4550 256MB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 123968 (2583%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 680 is the winner, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 29792 (1241%)

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 megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied 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 the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. 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 - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.