GeForce GT 440 3GB vs GeForce GTX 870M

Intro

Compare all of that to the GeForce GTX 870M, which comes with a GPU core clock speed of 941 MHz, and 3072 MB of GDDR5 RAM running at 1000 MHz through a 192-bit bus. It also is made up of 1344 Stream Processors, 112 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 3GB		56 Watts
GeForce GTX 870M		110 Watts
	Difference: 54 Watts (96%)

Memory Bandwidth

In theory, the GeForce GTX 870M will be 122% quicker than the GeForce GT 440 3GB in general, due to its higher bandwidth. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce GT 440 3GB		43200 MB/sec
	Difference: 52800 (122%)

Texel Rate

The GeForce GTX 870M will be much (about 639%) more effective at texture filtering than the GeForce GT 440 3GB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GT 440 3GB		14256 Mtexels/sec
	Difference: 91136 (639%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 870M is a better choice, by a large margin. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 440 3GB		14256 Mpixels/sec
	Difference: 8328 (58%)

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 (measured in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.