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GeForce 8800 GTS (G92) vs Radeon HD 5830

Intro

The GeForce 8800 GTS (G92) comes with clock speeds of 650 MHz on the GPU, and 970 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 5830, which has GPU clock speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also features 1120(224x5) SPUs, 56 Texture Address Units, 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

Theoretically speaking, the Radeon HD 5830 should be 106% faster than the GeForce 8800 GTS (G92) overall, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 5830 will be a small bit (more or less 8%) more effective at anisotropic 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 should be much (approximately 23%) faster with regards to FSAA than the GeForce 8800 GTS (G92), and also will be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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