GeForce GTX 650 Ti 2GB vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which has clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

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 much better than the GeForce GTX 850M in general. (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 quite a bit (approximately 69%) faster with regards to anisotropic filtering 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

If using high levels of AA is important to you, then the GeForce GTX 650 Ti 2GB is a better choice, though only just barely. (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: Bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result 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 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 is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.