GeForce GTX 460 (OEM) vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which features 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 comprised of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTX 460 (OEM)		150 Watts
	Difference: 110 Watts (275%)

Memory Bandwidth

The GeForce GTX 460 (OEM) should in theory be much faster than the GeForce GTX 850M overall. (explain)

GeForce GTX 460 (OEM)		108800 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 76800 (240%)

Texel Rate

The GeForce GTX 460 (OEM) is a bit (about 4%) faster with regards to AF than the GeForce GTX 850M. (explain)

GeForce GTX 460 (OEM)		36400 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 1360 (4%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 460 (OEM) is the winner, by far. (explain)

GeForce GTX 460 (OEM)		20800 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 6784 (48%)

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 maximum amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.