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

Intro

Compare those specs to the Radeon HD 5830, which features a core clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 1120(224x5) SPUs, 56 Texture Address Units, and 16 ROPs.

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

Theoretically, the Radeon HD 5830 should be much faster than the GeForce 8800 GTS (G80) 320MB in general. (explain)

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

Texel Rate

The Radeon HD 5830 should be much (about 82%) faster with regards to texture filtering 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 will be much (approximately 25%) faster with regards to full screen 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: Bandwidth is the largest amount of data (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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