GeForce 820M vs GeForce GTX Titan X

Intro

Compare those specifications to the GeForce GTX Titan X, which uses a 28 nm design. nVidia has clocked the core speed at 1000 MHz. The GDDR5 memory is set to run at a speed of 1750 MHz on this specific card. It features 3072 SPUs along with 192 Texture Address Units and 96 Rasterization Operator 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 Titan X		17879 points
GeForce 820M		850 points
	Difference: 17029 (2003%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX Titan X		250 Watts
	Difference: 235 Watts (1567%)

Memory Bandwidth

Performance-wise, the GeForce GTX Titan X should in theory be much better than the GeForce 820M in general. (explain)

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

Texel Rate

The GeForce GTX Titan X will be a lot (about 1569%) faster with regards to AF than the GeForce 820M. (explain)

GeForce GTX Titan X		192000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 180496 (1569%)

Pixel Rate

The GeForce GTX Titan X should be a lot (approximately 3238%) better at AA than the GeForce 820M, and also capable of handling higher screen resolutions better. (explain)

GeForce GTX Titan X		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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics 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 most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.