GeForce GT 640 DDR3 vs Nvidia Titan X

Intro

Compare that to the Nvidia Titan X, which makes use of a 16 nm design. nVidia has set the core speed at 1417 MHz. The GDDR5X memory runs at a frequency of 1251 MHz on this card. It features 3584 SPUs as well as 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

Performance-wise, the Nvidia Titan X should in theory be a lot superior to the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The Nvidia Titan X will be quite a bit (more or less 1002%) faster with regards to AF 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 high levels of AA is important to you, then the Nvidia Titan X is superior to the GeForce GT 640 DDR3, by a large margin. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.