GeForce 820M vs GeForce GT 130

Intro

Compare those specifications to the GeForce GT 130, which has core speeds of 500 MHz on the GPU, and 250 MHz on the 768 MB of DDR2 memory. It features 48 SPUs along with 24 TAUs and 16 Rasterization Operator Units.

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

Theoretically speaking, the GeForce 820M should be a lot 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 should be a little bit (approximately 4%) faster with regards to texture filtering 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 is quite a bit (about 178%) better at FSAA than the GeForce 820M, and also capable of handling higher screen resolutions without losing too much performance. (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 information (in units of MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.