GeForce 820M vs GeForce GTX 980

Intro

Compare all of that to the GeForce GTX 980, which comes with core clock speeds of 1126 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 64 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 980		13552 points
GeForce 820M		850 points
	Difference: 12702 (1494%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 980		165 Watts
	Difference: 150 Watts (1000%)

Memory Bandwidth

The GeForce GTX 980 should in theory perform quite a bit faster than the GeForce 820M overall. (explain)

GeForce GTX 980		224000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 980 should be quite a bit (approximately 1153%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 132624 (1153%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 980 is the winner, and very much so. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 69188 (2406%)

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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number 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 filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.