GeForce 840M vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which uses a 28 nm design. nVidia has clocked the core speed at 876 MHz. The DDR3 RAM works at a speed of 1000 MHz on this particular card. It features 640 SPUs along with 40 TAUs and 16 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 850M		3340 points
GeForce 840M		1600 points
	Difference: 1740 (109%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 850M		40 Watts
	Difference: 10 Watts (33%)

Memory Bandwidth

In theory, the GeForce GTX 850M should perform a lot faster than the GeForce 840M in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTX 850M is a lot (more or less 42%) better at anisotropic filtering than the GeForce 840M. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 10344 (42%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 850M is superior to the GeForce 840M, by far. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 5784 (70%)

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 (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 maximum fill rate.