GeForce GT 450 (OEM) vs Radeon HD 6850

Intro

Compare all that to the Radeon HD 6850, which features GPU core speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 Stream Processors, 48 Texture Address Units, and 32 Raster Operation Units.

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

In theory, the Radeon HD 6850 should perform a lot 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 is quite a bit (approximately 96%) more effective at AF 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 will be quite a bit (more or less 31%) better at AA than the GeForce GT 450 (OEM), and should be capable of handling higher screen resolutions without losing too much performance. (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 data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at 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 that the graphics 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 amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.