GeForce 820M vs GeForce GTX 980 Ti

Intro

Compare that to the GeForce GTX 980 Ti, which features a GPU core clock speed of 1000 MHz, and 6144 MB of GDDR5 RAM set to run at 1750 MHz through a 384-bit bus. It also is made up of 2816 SPUs, 176 TAUs, and 96 Raster Operation Units.

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 980 Ti		17120 points
GeForce 820M		850 points
	Difference: 16270 (1914%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 980 Ti		250 Watts
	Difference: 235 Watts (1567%)

Memory Bandwidth

The GeForce GTX 980 Ti should in theory be a lot faster than the GeForce 820M overall. (explain)

GeForce GTX 980 Ti		336000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 320000 (2000%)

Texel Rate

The GeForce GTX 980 Ti should be quite a bit (about 1430%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce GTX 980 Ti		176000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 164496 (1430%)

Pixel Rate

The GeForce GTX 980 Ti should be quite a bit (more or less 3238%) better at full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 980 Ti		96000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 93124 (3238%)

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 data (measured in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, 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 graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.