GeForce GT 220 GDDR3 vs GeForce GTX 850M

Intro

Compare that to the GeForce GTX 850M, which makes use of a 28 nm design. nVidia has clocked the core speed at 876 MHz. The DDR3 memory is set to run at a speed of 1000 MHz on this specific card. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

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

Theoretically speaking, the GeForce GT 220 GDDR3 should be a small bit faster 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 much (more or less 250%) faster with regards to AF 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

If running with a high screen resolution is important to you, then the GeForce GTX 850M is a better choice, by a large margin. (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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.