GeForce GTX 650 Ti 2GB vs GeForce GTX 850M

Intro

Compare those specifications 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 frequency of 1000 MHz on this model. It features 640 SPUs along with 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 650 Ti 2GB		110 Watts
	Difference: 70 Watts (175%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 Ti 2GB should theoretically be a lot superior to the GeForce GTX 850M overall. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 54400 (170%)

Texel Rate

The GeForce GTX 650 Ti 2GB will be much (more or less 69%) more effective at AF than the GeForce GTX 850M. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 24352 (69%)

Pixel Rate

The GeForce GTX 650 Ti 2GB should be a little bit (approximately 6%) faster with regards to FSAA than the GeForce GTX 850M, and also capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 832 (6%)

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.