GeForce GT 640 DDR3 vs GeForce GTX 1080

Intro

Compare that to the GeForce GTX 1080, which comes with core speeds of 1607 MHz on the GPU, and 1251 MHz on the 8192 MB of GDDR5X RAM. It features 2560 SPUs as well as 160 TAUs and 64 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

Theoretically speaking, the GeForce GTX 1080 should be 475% faster than the GeForce GT 640 DDR3 in general, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 1080 should be quite a bit (about 793%) better at anisotropic 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

If running with a high screen resolution is important to you, then the GeForce GTX 1080 is the winner, by far. (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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.