GeForce 820M vs GeForce GTX 780 Ti

Intro

Compare that to the GeForce GTX 780 Ti, which has a core clock speed of 875 MHz and a GDDR5 memory frequency of 1750 MHz. It also features a 384-bit bus, and uses a 28 nm design. It is made up of 2880 SPUs, 240 TAUs, and 48 ROPs.

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

Performance-wise, the GeForce GTX 780 Ti should theoretically be much superior to 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 is much (about 1725%) more effective at anisotropic 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 resolution is important to you, then the GeForce GTX 780 Ti is superior to the GeForce 820M, by far. (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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.