GeForce 840M vs Nvidia Titan X

Intro

Compare that to the Nvidia Titan X, which has core speeds of 1417 MHz on the GPU, and 1251 MHz on the 12288 MB of GDDR5X memory. It features 3584 SPUs as well as 224 Texture Address Units and 96 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
Nvidia Titan X		250 Watts
	Difference: 220 Watts (733%)

Memory Bandwidth

Theoretically speaking, the Nvidia Titan X is 2972% faster than the GeForce 840M in general, because of its higher bandwidth. (explain)

Nvidia Titan X		491520 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 475520 (2972%)

Texel Rate

The Nvidia Titan X will be quite a bit (about 1185%) faster with regards to anisotropic filtering than the GeForce 840M. (explain)

Nvidia Titan X		317408 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 292712 (1185%)

Pixel Rate

The Nvidia Titan X should be much (about 1552%) more effective at full screen anti-aliasing than the GeForce 840M, and also capable of handling higher screen resolutions better. (explain)

Nvidia Titan X		136032 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 127800 (1552%)

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 (counted in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.