GeForce 820M vs GeForce GT 440 3GB

Intro

Compare those specs to the GeForce GT 440 3GB, which makes use of a 40 nm design. nVidia has clocked the core frequency at 594 MHz. The GDDR3 RAM works at a frequency of 900 MHz on this specific card. It features 144 SPUs along with 24 TAUs 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 170% faster than the GeForce 820M in general, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GT 440 3GB should be a lot (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

If using lots of anti-aliasing is important to you, then the GeForce GT 440 3GB is the winner, by far. (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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling 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 its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.