Geforce GTX 680 vs Radeon HD 4730

Intro

Compare that to the Radeon HD 4730, which has a clock speed of 700 MHz and a GDDR5 memory speed of 900 MHz. It also features a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4730		140 Watts
Geforce GTX 680		195 Watts
	Difference: 55 Watts (39%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be 234% faster than the Radeon HD 4730 in general, due to its greater data rate. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 134656 (234%)

Texel Rate

The Geforce GTX 680 is much (approximately 475%) better at texture filtering than the Radeon HD 4730. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 106368 (475%)

Pixel Rate

If using high levels of AA 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 4730		5600 Mpixels/sec
	Difference: 26592 (475%)

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 data (counted in MB per second) that can be transferred across the external memory interface in one second. It's 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 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 number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.