GeForce GT 640 DDR3 vs GeForce GTX 1080

Intro

Compare all that to the GeForce GTX 1080, which comes with clock 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 ROPs.

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

The GeForce GTX 1080 should in theory be quite a bit faster than the GeForce GT 640 DDR3 in general. (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 a lot (more or less 793%) better at 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 quite a bit (approximately 614%) faster with regards to AA than the GeForce GT 640 DDR3, and also should be able to handle higher screen resolutions better. (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 max amount of information (measured in MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of 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 processed in one 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 amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.