GeForce GT 220 GDDR3 vs Radeon HD 6850

Intro

Compare those specs to the Radeon HD 6850, which comes with a clock frequency of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is comprised of 960 SPUs, 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 220 GDDR3		58 Watts
Radeon HD 6850		127 Watts
	Difference: 69 Watts (119%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should theoretically be quite a bit better than the GeForce GT 220 GDDR3 in general. (explain)

Radeon HD 6850		128000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 95616 (295%)

Texel Rate

The Radeon HD 6850 will be a lot (more or less 272%) better at texture filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 6850		37200 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 27200 (272%)

Pixel Rate

The Radeon HD 6850 is quite a bit (more or less 396%) more effective at anti-aliasing than the GeForce GT 220 GDDR3, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6850		24800 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 19800 (396%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 can be processed in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few 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.