GeForce 820M vs GeForce 930M

Intro

Compare those specs to the GeForce 930M, which comes with GPU core speed of 928 MHz, and 2048 MB of DDR3 memory running at 900 MHz through a 64-bit bus. It also is comprised of 384 SPUs, 24 Texture Address Units, and 8 Raster Operation 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 930M		1490 points
GeForce 820M		850 points
	Difference: 640 (75%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce 820M should theoretically be a small bit superior to the GeForce 930M overall. (explain)

GeForce 820M		16000 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 930M is quite a bit (more or less 94%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce 930M		22272 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 10768 (94%)

Pixel Rate

The GeForce 930M will be much (more or less 158%) more effective at FSAA than the GeForce 820M, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 930M		7424 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 4548 (158%)

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 MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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