GeForce 820M vs GeForce 830M

Intro

Compare those specs to the GeForce 830M, which makes use of a 28 nm design. nVidia has set the core frequency at 1029 MHz. The DDR3 RAM is set to run at a frequency of 900 MHz on this card. It features 256 SPUs along with 16 TAUs 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

The GeForce 820M, in theory, should be just 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 will be a lot (more or less 43%) faster with regards to 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 should be a lot (about 186%) more effective at FSAA than the GeForce 820M, and also will be capable of handling 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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one 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 number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.