GeForce GTX 650 vs GeForce GTX 780 Ti

Intro

Compare that to the GeForce GTX 780 Ti, which uses a 28 nm design. nVidia has clocked the core speed at 875 MHz. The GDDR5 memory runs at a speed of 1750 MHz on this card. It features 2880 SPUs along with 240 TAUs and 48 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 780 Ti		10900 points
GeForce GTX 650		2263 points
	Difference: 8637 (382%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 780 Ti		250 Watts
	Difference: 186 Watts (291%)

Memory Bandwidth

Theoretically, the GeForce GTX 780 Ti should perform quite a bit faster than the GeForce GTX 650 in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 256000 (320%)

Texel Rate

The GeForce GTX 780 Ti is a lot (about 520%) faster with regards to AF than the GeForce GTX 650. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 176144 (520%)

Pixel Rate

The GeForce GTX 780 Ti is a lot (more or less 148%) faster with regards to full screen anti-aliasing than the GeForce GTX 650, and should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 25072 (148%)

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 data (counted in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.