GeForce GT 640 DDR3 vs Nvidia Titan X

Intro

Compare all that to the Nvidia Titan X, which comes with GPU core speed of 1417 MHz, and 12288 MB of GDDR5X memory 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 GT 640 DDR3		65 Watts
Nvidia Titan X		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically, the Nvidia Titan X should be much faster than the GeForce GT 640 DDR3 in general. (explain)

Nvidia Titan X		491520 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 434496 (762%)

Texel Rate

The Nvidia Titan X is a lot (about 1002%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Nvidia Titan X		317408 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 288608 (1002%)

Pixel Rate

If running with a high resolution is important to you, then the Nvidia Titan X is a better choice, and very much so. (explain)

Nvidia Titan X		136032 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 121632 (845%)

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 data (measured in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.