GeForce GTX 465 vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which comes with a GPU core clock speed of 876 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 128-bit bus. It also features 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 GTX 465		200 Watts
	Difference: 160 Watts (400%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 465 should perform quite a bit faster than the GeForce GTX 850M in general. (explain)

GeForce GTX 465		102592 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 70592 (221%)

Texel Rate

The GeForce GTX 850M will be a lot (about 31%) more effective at AF than the GeForce GTX 465. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 8332 (31%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 465 is a better choice, by a large margin. (explain)

GeForce GTX 465		19424 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 5408 (39%)

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

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.