GeForce 840M vs GeForce GTX 870M

Intro

Compare all that to the GeForce GTX 870M, which features a clock frequency of 941 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 192-bit memory bus, and uses a 28 nm design. It features 1344 SPUs, 112 TAUs, and 24 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 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

The GeForce GTX 870M, in theory, should perform a lot faster than the GeForce 840M overall. (explain)

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

Texel Rate

The GeForce GTX 870M is much (more or less 327%) better at texture filtering 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 is much (about 174%) faster with regards to AA than the GeForce 840M, and also will be capable of handling higher screen resolutions better. (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 largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that are applied in one second. This figure is calculated 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 graphics card will be at handling 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 the graphics 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 Raster Operations Pipelines 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.