GeForce GT 450 (OEM) vs Radeon HD 6850

Intro

Compare all that to the Radeon HD 6850, which comes with GPU clock speed of 775 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is made up of 960 Stream Processors, 48 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 6850		127 Watts
	Difference: 21 Watts (20%)

Memory Bandwidth

Theoretically, the Radeon HD 6850 should be quite a bit faster than the GeForce GT 450 (OEM) in general. (explain)

Radeon HD 6850		128000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 32000 (33%)

Texel Rate

The Radeon HD 6850 should be a lot (approximately 96%) more effective at texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 6850		37200 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 18240 (96%)

Pixel Rate

The Radeon HD 6850 should be a lot (about 31%) better at FSAA than the GeForce GT 450 (OEM), and should be able to handle higher resolutions better. (explain)

Radeon HD 6850		24800 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 5840 (31%)

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 max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video 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 maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.