GeForce GT 220 GDDR3 vs Radeon HD 6850

Intro

Compare all of that to the Radeon HD 6850, which comes with GPU core speed of 775 MHz, and 1024 MB of GDDR5 RAM 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)

GeForce GT 220 GDDR3		58 Watts
Radeon HD 6850		127 Watts
	Difference: 69 Watts (119%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should in theory be a lot better than the GeForce GT 220 GDDR3 overall. (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 (approximately 272%) faster with regards to AF 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 should be quite a bit (more or less 396%) better at AA than the GeForce GT 220 GDDR3, and also should be capable of handling higher screen resolutions while still performing well. (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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.