GeForce 8800 GT 512MB vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which has a clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 44 Watts (72%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5670 is 11% faster than the GeForce 8800 GT 512MB overall, due to its higher data rate. (explain)

Radeon HD 5670		64000 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The GeForce 8800 GT 512MB should be much (about 117%) more effective at anisotropic filtering than the Radeon HD 5670. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 18100 (117%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 8800 GT 512MB is the winner, by a large margin. (explain)

GeForce 8800 GT 512MB		9600 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 3400 (55%)

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 (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units 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 processed per second.

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