GeForce 840M vs GeForce GTX 1080

Intro

Compare those specifications to the GeForce GTX 1080, which has GPU clock speed of 1607 MHz, and 8192 MB of GDDR5X RAM running at 1251 MHz through a 256-bit bus. It also features 2560 Stream Processors, 160 Texture Address Units, and 64 ROPs.

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 840M		1600 points
	Difference: 20342 (1271%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 1080		180 Watts
	Difference: 150 Watts (500%)

Memory Bandwidth

The GeForce GTX 1080 should in theory be quite a bit faster than the GeForce 840M overall. (explain)

GeForce GTX 1080		327680 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 311680 (1948%)

Texel Rate

The GeForce GTX 1080 will be quite a bit (more or less 941%) better at AF than the GeForce 840M. (explain)

GeForce GTX 1080		257120 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 232424 (941%)

Pixel Rate

The GeForce GTX 1080 will be a lot (approximately 1149%) more effective at anti-aliasing than the GeForce 840M, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 1080		102848 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 94616 (1149%)

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 maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 number is worked out by multiplying the total texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.