GeForce 840M vs Nvidia Titan X

Intro

Compare all of that to the Nvidia Titan X, which features a GPU core clock speed of 1417 MHz, and 12288 MB of GDDR5X RAM set to run at 1251 MHz through a 384-bit bus. It also is made up of 3584 SPUs, 224 Texture Address Units, and 96 ROPs.

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 should be 2972% quicker than the GeForce 840M overall, due to its greater data rate. (explain)

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

Texel Rate

The Nvidia Titan X is quite a bit (more or less 1185%) more effective at 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 (approximately 1552%) more effective at full screen anti-aliasing than the GeForce 840M, and 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 largest amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the 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 the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.