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GeForce 8800 GTS (G92) vs Radeon HD 5830

Intro

The GeForce 8800 GTS (G92) features a core clock frequency of 650 MHz and a GDDR3 memory speed of 970 MHz. It also makes use of a 256-bit bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G92)		135 Watts
Radeon HD 5830		175 Watts
	Difference: 40 Watts (30%)

Memory Bandwidth

The Radeon HD 5830 should theoretically be a lot faster than the GeForce 8800 GTS (G92) in general. (explain)

Radeon HD 5830		128000 MB/sec
GeForce 8800 GTS (G92)		62080 MB/sec
	Difference: 65920 (106%)

Texel Rate

The Radeon HD 5830 is a small bit (approximately 8%) better at texture filtering than the GeForce 8800 GTS (G92). (explain)

Radeon HD 5830		44800 Mtexels/sec
GeForce 8800 GTS (G92)		41600 Mtexels/sec
	Difference: 3200 (8%)

Pixel Rate

The Radeon HD 5830 will be much (approximately 23%) more effective at AA than the GeForce 8800 GTS (G92), and also will be capable of handling higher resolutions better. (explain)

Radeon HD 5830		12800 Mpixels/sec
GeForce 8800 GTS (G92)		10400 Mpixels/sec
	Difference: 2400 (23%)

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

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GeForce 8800 GTS (G92)

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Radeon HD 5830

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Specifications

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Model	GeForce 8800 GTS (G92)	Radeon HD 5830
Manufacturer	nVidia	AMD
Year	Dec 2007	February 25, 2010
Code Name	G92	Cypress LE
Memory	512 MB	1024 MB
Core Speed	650 MHz	800 MHz
Memory Speed	1940 MHz	4000 MHz
Power (Max TDP)	135 watts	175 watts
Bandwidth	62080 MB/sec	128000 MB/sec
Texel Rate	41600 Mtexels/sec	44800 Mtexels/sec
Pixel Rate	10400 Mpixels/sec	12800 Mpixels/sec
Unified Shaders	128	1120(224x5)
Texture Mapping Units	64	56
Render Output Units	16	16
Bus Type	GDDR3	GDDR5
Bus Width	256-bit	256-bit
Fab Process	65 nm	40 nm
Transistors	754 million	2154 million
Bus	PCIe x16 2.0	PCIe 2.1 x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 3.2

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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