GeForce GT 220 GDDR3 vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which has clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 18 Watts (45%)

Memory Bandwidth

Performance-wise, the GeForce GT 220 GDDR3 should in theory be a bit better than the GeForce GTX 850M in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 384 (1%)

Texel Rate

The GeForce GTX 850M should be a lot (approximately 250%) faster with regards to anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 25040 (250%)

Pixel Rate

The GeForce GTX 850M is much (more or less 180%) faster with regards to full screen anti-aliasing than the GeForce GT 220 GDDR3, and will be able to handle higher resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 9016 (180%)

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 MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.