GeForce GTX 285 2GB vs Radeon HD 6850

Intro

Compare those specs to the Radeon HD 6850, which has GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 256-bit bus. It also is comprised of 960 Stream Processors, 48 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850		127 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 77 Watts (61%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should perform quite a bit faster than the Radeon HD 6850 in general. (explain)

GeForce GTX 285 2GB		158976 MB/sec
Radeon HD 6850		128000 MB/sec
	Difference: 30976 (24%)

Texel Rate

The GeForce GTX 285 2GB should be quite a bit (more or less 39%) faster with regards to texture filtering than the Radeon HD 6850. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
Radeon HD 6850		37200 Mtexels/sec
	Difference: 14640 (39%)

Pixel Rate

The Radeon HD 6850 is a bit (more or less 20%) better at anti-aliasing than the GeForce GTX 285 2GB, and also will be capable of handling higher screen resolutions better. (explain)

Radeon HD 6850		24800 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 4064 (20%)

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 (measured in megabytes per second) that can be transported over 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 should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.