GeForce 8800 GT 512MB vs Radeon HD 4670 512MB

Intro

Compare those specs to the Radeon HD 4670 512MB, which features a clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1000 MHz. It also features a 128-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 35 Watts (50%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GT 512MB will be 80% quicker than the Radeon HD 4670 512MB in general, due to its greater bandwidth. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The GeForce 8800 GT 512MB will be much (more or less 40%) better at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 9600 (40%)

Pixel Rate

The GeForce 8800 GT 512MB will be a lot (approximately 60%) better at FSAA than the Radeon HD 4670 512MB, and should be able to handle higher resolutions while still performing well. (explain)

GeForce 8800 GT 512MB		9600 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 3600 (60%)

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 information (counted in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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