GeForce 840M vs GeForce GTX 870M

Intro

Compare those specifications to the GeForce GTX 870M, which comes with GPU clock speed of 941 MHz, and 3072 MB of GDDR5 RAM set to run at 1000 MHz through a 192-bit bus. It also features 1344 Stream Processors, 112 TAUs, and 24 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 870M		4770 points
GeForce 840M		1600 points
	Difference: 3170 (198%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 870M		110 Watts
	Difference: 80 Watts (267%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 870M should theoretically be a lot superior to the GeForce 840M in general. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 80000 (500%)

Texel Rate

The GeForce GTX 870M will be quite a bit (about 327%) more effective at AF than the GeForce 840M. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 80696 (327%)

Pixel Rate

The GeForce GTX 870M should be much (about 174%) more effective at full screen anti-aliasing than the GeForce 840M, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 14352 (174%)

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 information (in units of megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, 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 that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.