GeForce 840M vs GeForce GTX 980

Intro

Compare all of that to the GeForce GTX 980, which has a core clock speed of 1126 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 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

Performance-wise, the GeForce GTX 980 should theoretically be quite a bit better than the GeForce 840M in general. (explain)

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

Texel Rate

The GeForce GTX 980 will be much (approximately 484%) more effective at texture filtering than the GeForce 840M. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 980 is the winner, by far. (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 largest amount of data (measured in MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better 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 most pixels the graphics card could possibly record to its 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 clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.