GeForce 820M vs GeForce GTX 780 Ti

Intro

Compare all that to the GeForce GTX 780 Ti, which comes with GPU clock speed of 875 MHz, and 3072 MB of GDDR5 RAM set to run at 1750 MHz through a 384-bit bus. It also is made up of 2880 SPUs, 240 TAUs, and 48 Raster Operation Units.

Display Graphs

Hide Graphs

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 820M		850 points
	Difference: 10050 (1182%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 780 Ti		250 Watts
	Difference: 235 Watts (1567%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 780 Ti should be a lot faster than the GeForce 820M overall. (explain)

GeForce GTX 780 Ti		336000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 320000 (2000%)

Texel Rate

The GeForce GTX 780 Ti will be much (more or less 1725%) better at texture filtering than the GeForce 820M. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 198496 (1725%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 780 Ti is superior to the GeForce 820M, by a large margin. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 39124 (1360%)

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 maximum amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the 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. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.