GeForce GT 450 (OEM) vs Radeon HD 6850

Intro

Compare all of that to the Radeon HD 6850, which comes with GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised 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

In theory, the Radeon HD 6850 should be 33% faster than the GeForce GT 450 (OEM) overall, because of its greater bandwidth. (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 much (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 is a lot (more or less 31%) more effective at full screen anti-aliasing than the GeForce GT 450 (OEM), and should be able to handle higher screen resolutions while still performing well. (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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.