GeForce 820M vs GeForce 920M

Intro

Compare that to the GeForce 920M, which has a GPU core clock speed of 954 MHz, and 2048 MB of DDR3 memory running at 900 MHz through a 64-bit bus. It also features 384 Stream Processors, 32 TAUs, and 8 ROPs.

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 920M		1180 points
GeForce 820M		850 points
	Difference: 330 (39%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce 820M is 11% faster than the GeForce 920M in general, because of its greater data rate. (explain)

GeForce 820M		16000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 920M will be much (more or less 165%) more effective at AF than the GeForce 820M. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 19024 (165%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 920M is the winner, by far. (explain)

GeForce 920M		7632 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 4756 (165%)

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 data (in units of megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units of the card by the core 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.