GeForce 840M vs GeForce GTX 980

Intro

Compare those specs to the GeForce GTX 980, which features a GPU core clock speed of 1126 MHz, and 4096 MB of GDDR5 memory running at 1750 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 64 Raster Operation 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 980		13552 points
GeForce 840M		1600 points
	Difference: 11952 (747%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 980		165 Watts
	Difference: 135 Watts (450%)

Memory Bandwidth

In theory, the GeForce GTX 980 is 1300% quicker than the GeForce 840M overall, because of its higher data rate. (explain)

GeForce GTX 980		224000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 208000 (1300%)

Texel Rate

The GeForce GTX 980 should be much (approximately 484%) faster with regards to AF than the GeForce 840M. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 119432 (484%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 980 is the winner, and very much so. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 63832 (775%)

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 max amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type 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 anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.