GeForce 8800 GTS (G80) 320MB vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which comes with a GPU core clock speed of 575 MHz, and 1024 MB of GDDR4 memory running at 900 MHz through a 256-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 48 Watts (51%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 320MB should perform just a bit faster than the Radeon HD 4830 1GB overall. (explain)

GeForce 8800 GTS (G80) 320MB		63360 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 5760 (10%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB is quite a bit (more or less 34%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 6224 (34%)

Pixel Rate

The GeForce 8800 GTS (G80) 320MB is a bit (about 12%) faster with regards to FSAA than the Radeon HD 4830 1GB, and able to handle higher resolutions without slowing down too much. (explain)

GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 1060 (12%)

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 (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure 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 outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.