GeForce 820M vs GeForce 830M

Intro

Compare those specifications to the GeForce 830M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 1029 MHz. The DDR3 memory works at a speed of 900 MHz on this specific card. It features 256 SPUs as well as 16 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 830M		25 Watts
	Difference: 10 Watts (67%)

Memory Bandwidth

Theoretically speaking, the GeForce 820M should be a bit faster than the GeForce 830M in general. (explain)

GeForce 820M		16000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 830M should be a lot (more or less 43%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce 830M		16464 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 4960 (43%)

Pixel Rate

The GeForce 830M will be quite a bit (about 186%) better at AA than the GeForce 820M, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce 830M		8232 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 5356 (186%)

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 data (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 amount of colour ROPs by the the card's clock speed. 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.