GeForce GT 240 GDDR5 vs GeForce GTX 850M

Intro

Compare that to the GeForce GTX 850M, which has GPU clock speed of 876 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 640 SPUs, 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 240 GDDR5		70 Watts
	Difference: 30 Watts (75%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 240 GDDR5 should be a lot faster than the GeForce GTX 850M in general. (explain)

GeForce GT 240 GDDR5		54400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 22400 (70%)

Texel Rate

The GeForce GTX 850M should be quite a bit (more or less 99%) faster with regards to texture filtering than the GeForce GT 240 GDDR5. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 17440 (99%)

Pixel Rate

The GeForce GTX 850M should be much (more or less 219%) faster with regards to AA than the GeForce GT 240 GDDR5, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 240 GDDR5		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 largest amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the 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 most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.