GeForce 8800 GTS (G80) 320MB vs Radeon HD 5830

Intro

Compare all of that to the Radeon HD 5830, which comes with a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is made up of 1120(224x5) SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 320MB		143 Watts
Radeon HD 5830		175 Watts
	Difference: 32 Watts (22%)

Memory Bandwidth

The Radeon HD 5830 should in theory perform a lot faster than the GeForce 8800 GTS (G80) 320MB overall. (explain)

Radeon HD 5830		128000 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 64640 (102%)

Texel Rate

The Radeon HD 5830 is much (approximately 82%) faster with regards to AF than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 5830		44800 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 20176 (82%)

Pixel Rate

The Radeon HD 5830 should be much (approximately 25%) more effective at anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and should be capable of handling higher resolutions better. (explain)

Radeon HD 5830		12800 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 2540 (25%)

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 (measured in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that are applied per second. This number is calculated 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.