GeForce 840M vs GeForce 920M

Intro

Compare that to the GeForce 920M, which makes use of a 28 nm design. nVidia has set the core speed at 954 MHz. The DDR3 memory runs at a speed of 900 MHz on this specific card. It features 384 SPUs as well as 32 TAUs and 8 Rasterization Operator 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 840M		1600 points
GeForce 920M		1180 points
	Difference: 420 (36%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 840M is 11% quicker than the GeForce 920M overall, due to its greater bandwidth. (explain)

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

Texel Rate

The GeForce 920M should be a lot (more or less 24%) better at anisotropic filtering than the GeForce 840M. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 840M is superior to the GeForce 920M, though not by far. (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 max amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.