GeForce GTX 650 Ti 2GB vs Geforce GTX 780

Intro

Compare those specifications to the Geforce GTX 780, which makes use of a 28 nm design. nVidia has set the core speed at 863 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this model. It features 2304 SPUs as well as 192 TAUs and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 2GB		110 Watts
Geforce GTX 780		250 Watts
	Difference: 140 Watts (127%)

Memory Bandwidth

Performance-wise, the Geforce GTX 780 should theoretically be much superior to the GeForce GTX 650 Ti 2GB in general. (explain)

Geforce GTX 780		288384 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 201984 (234%)

Texel Rate

The Geforce GTX 780 will be a lot (about 179%) more effective at AF than the GeForce GTX 650 Ti 2GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
	Difference: 106304 (179%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 780 is superior to the GeForce GTX 650 Ti 2GB, and very much so. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 26576 (179%)

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 (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of 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 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 texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at 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 the local memory per second - measured in millions of pixels per second. The number is calculated 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 memory bandwidth is, the lower the ability to get to the max fill rate.