Geforce GTX 680 vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which features GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory set to run at 1200 MHz through a 128-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Geforce GTX 680		195 Watts
	Difference: 87 Watts (81%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 will be 150% faster than the Radeon HD 5770 in general, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 115456 (150%)

Texel Rate

The Geforce GTX 680 is quite a bit (about 279%) more effective at AF than the Radeon HD 5770. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 94768 (279%)

Pixel Rate

The Geforce GTX 680 will be quite a bit (approximately 137%) better at AA than the Radeon HD 5770, and also should be capable of handling higher resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 18592 (137%)

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 MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.