GeForce GTX 460 1GB vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 876 MHz. The DDR3 memory works at a speed of 1000 MHz on this card. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTX 460 1GB		160 Watts
	Difference: 120 Watts (300%)

Memory Bandwidth

The GeForce GTX 460 1GB, in theory, should be quite a bit faster than the GeForce GTX 850M in general. (explain)

GeForce GTX 460 1GB		115200 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 83200 (260%)

Texel Rate

The GeForce GTX 460 1GB should be a small bit (about 8%) more effective at AF than the GeForce GTX 850M. (explain)

GeForce GTX 460 1GB		37800 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 2760 (8%)

Pixel Rate

The GeForce GTX 460 1GB should be much (about 54%) faster with regards to full screen anti-aliasing than the GeForce GTX 850M, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 460 1GB		21600 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 7584 (54%)

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 information (counted in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount 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 speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.