GeForce GTX 650 Ti 2GB vs Geforce GTX 780

Intro

Compare that to the Geforce GTX 780, which has a GPU core clock speed of 863 MHz, and 3072 MB of GDDR5 RAM running at 1502 MHz through a 384-bit bus. It also is made up of 2304 SPUs, 192 Texture Address Units, 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

The Geforce GTX 780 should theoretically be much faster than the GeForce GTX 650 Ti 2GB overall. (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 quite a bit (approximately 179%) better at anisotropic filtering 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

The Geforce GTX 780 is quite a bit (approximately 179%) more effective at AA than the GeForce GTX 650 Ti 2GB, and able to handle higher screen resolutions better. (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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.