GeForce GTX 650 Ti 2GB vs GeForce GTX 870M

Intro

Compare those specs to the GeForce GTX 870M, which uses a 28 nm design. nVidia has set the core speed at 941 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this particular card. It features 1344 SPUs as well as 112 TAUs and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the GeForce GTX 870M should be a little bit faster than the GeForce GTX 650 Ti 2GB in general. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 9600 (11%)

Texel Rate

The GeForce GTX 870M will be much (about 77%) faster with regards to anisotropic filtering than the GeForce GTX 650 Ti 2GB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
	Difference: 46000 (77%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is the winner, and very much so. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 7736 (52%)

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 max amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video 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 amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.