GeForce 820M vs GeForce GT 130

Intro

Compare that to the GeForce GT 130, which comes with core clock speeds of 500 MHz on the GPU, and 250 MHz on the 768 MB of DDR2 RAM. It features 48 SPUs as well as 24 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 130		75 Watts
	Difference: 60 Watts (400%)

Memory Bandwidth

The GeForce 820M should theoretically be quite a bit faster than the GeForce GT 130 overall. (explain)

GeForce 820M		16000 MB/sec
GeForce GT 130		12000 MB/sec
	Difference: 4000 (33%)

Texel Rate

The GeForce GT 130 is just a bit (about 4%) more effective at AF than the GeForce 820M. (explain)

GeForce GT 130		12000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 496 (4%)

Pixel Rate

The GeForce GT 130 will be a lot (more or less 178%) more effective at anti-aliasing than the GeForce 820M, and also capable of handling higher resolutions while still performing well. (explain)

GeForce GT 130		8000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 5124 (178%)

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 max amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video 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 video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.