GeForce GT 640 DDR3 vs GeForce GTX 1080

Intro

Compare those specs to the GeForce GTX 1080, which uses a 16 nm design. nVidia has set the core speed at 1607 MHz. The GDDR5X RAM runs at a frequency of 1251 MHz on this card. It features 2560 SPUs as well as 160 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 1080		21942 points
GeForce GT 640 DDR3		1560 points
	Difference: 20382 (1307%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 1080		180 Watts
	Difference: 115 Watts (177%)

Memory Bandwidth

In theory, the GeForce GTX 1080 should be quite a bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 1080		327680 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 270656 (475%)

Texel Rate

The GeForce GTX 1080 will be a lot (about 793%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 1080		257120 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 228320 (793%)

Pixel Rate

The GeForce GTX 1080 should be much (more or less 614%) faster with regards to AA than the GeForce GT 640 DDR3, and able to handle higher resolutions more effectively. (explain)

GeForce GTX 1080		102848 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 88448 (614%)

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 moved over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.