GeForce 8800 GTS (G80) 640MB vs Radeon HD 4670 512MB

Intro

Compare those specifications to the Radeon HD 4670 512MB, which features GPU clock speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM running at 1000 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 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 GTS (G80) 640MB		143 Watts
	Difference: 73 Watts (104%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G80) 640MB should in theory be a lot better than the Radeon HD 4670 512MB overall. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 31360 (98%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB is a bit (about 3%) better at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 624 (3%)

Pixel Rate

The GeForce 8800 GTS (G80) 640MB should be quite a bit (approximately 71%) faster with regards to anti-aliasing than the Radeon HD 4670 512MB, and able to handle higher screen resolutions without losing too much performance. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 4260 (71%)

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics 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 number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.