GeForce 820M vs GeForce GT 440 3GB

Intro

Compare all of that to the GeForce GT 440 3GB, which makes use of a 40 nm design. nVidia has set the core frequency at 594 MHz. The GDDR3 memory is set to run at a frequency of 900 MHz on this specific card. It features 144 SPUs along with 24 Texture Address Units and 24 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 440 3GB		56 Watts
	Difference: 41 Watts (273%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 440 3GB should be much faster than the GeForce 820M overall. (explain)

GeForce GT 440 3GB		43200 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 27200 (170%)

Texel Rate

The GeForce GT 440 3GB is much (about 24%) faster with regards to texture filtering than the GeForce 820M. (explain)

GeForce GT 440 3GB		14256 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 2752 (24%)

Pixel Rate

The GeForce GT 440 3GB is quite a bit (more or less 396%) faster with regards to FSAA than the GeForce 820M, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GT 440 3GB		14256 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11380 (396%)

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 (counted in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should 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 high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.