GeForce GT 230 vs GeForce GTX 850M

Intro

Compare that to the GeForce GTX 850M, which features GPU core speed of 876 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 230		65 Watts
	Difference: 25 Watts (63%)

Memory Bandwidth

As far as performance goes, the GeForce GT 230 should theoretically be a small bit better than the GeForce GTX 850M in general. (explain)

GeForce GT 230		38400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 6400 (20%)

Texel Rate

The GeForce GTX 850M should be much (more or less 298%) faster with regards to AF than the GeForce GT 230. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 230		8800 Mtexels/sec
	Difference: 26240 (298%)

Pixel Rate

The GeForce GTX 850M should be much (more or less 219%) faster with regards to FSAA than the GeForce GT 230, and should be capable of handling higher resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 230		4400 Mpixels/sec
	Difference: 9616 (219%)

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 information (counted in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.