GeForce 840M vs Nvidia Titan X

Intro

Compare all that to the Nvidia Titan X, which uses a 16 nm design. nVidia has set the core speed at 1417 MHz. The GDDR5X RAM runs at a speed of 1251 MHz on this specific model. It features 3584 SPUs as well as 224 TAUs 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

In theory, the Nvidia Titan X is 2972% quicker than the GeForce 840M in general, because of 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 should be a lot (about 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

If running with high levels of AA is important to you, then the Nvidia Titan X is the winner, and very much so. (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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.