GeForce 840M vs GeForce 920M

Intro

Compare that to the GeForce 920M, which uses a 28 nm design. nVidia has clocked the core frequency at 954 MHz. The DDR3 RAM works at a speed of 900 MHz on this card. It features 384 SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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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 840M		1600 points
GeForce 920M		1180 points
	Difference: 420 (36%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce 840M will be 11% quicker than the GeForce 920M overall, because of its greater data rate. (explain)

GeForce 840M		16000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 920M will be quite a bit (approximately 24%) faster with regards to anisotropic filtering than the GeForce 840M. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 5832 (24%)

Pixel Rate

The GeForce 840M is just a bit (more or less 8%) faster with regards to AA than the GeForce 920M, and should be able to handle higher resolutions while still performing well. (explain)

GeForce 840M		8232 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 600 (8%)

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 maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.