GeForce GTX 650 vs GeForce GTX 650 Ti 2GB

Intro

Compare that to the GeForce GTX 650 Ti 2GB, which features GPU core speed of 928 MHz, and 2048 MB of GDDR5 memory running at 1350 MHz through a 128-bit bus. It also features 768 Stream Processors, 64 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 650 Ti 2GB		110 Watts
	Difference: 46 Watts (72%)

Memory Bandwidth

In theory, the GeForce GTX 650 Ti 2GB should be 8% quicker than the GeForce GTX 650 in general, because of its greater data rate. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 6400 (8%)

Texel Rate

The GeForce GTX 650 Ti 2GB is quite a bit (more or less 75%) better at texture filtering than the GeForce GTX 650. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 25536 (75%)

Pixel Rate

The GeForce GTX 650 is a small bit (about 14%) faster with regards to full screen anti-aliasing than the GeForce GTX 650 Ti 2GB, and also should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 2080 (14%)

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 data (counted in megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the 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 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.