GeForce 820M vs GeForce GT 440 1.5GB

Intro

Compare those specs to the GeForce GT 440 1.5GB, which uses a 40 nm design. nVidia has set the core frequency at 594 MHz. The GDDR3 memory works at a frequency of 900 MHz on this model. It features 144 SPUs along with 24 Texture Address Units and 24 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce 820M		850 points
GeForce GT 440 1.5GB		840 points
	Difference: 10 (1%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 440 1.5GB		56 Watts
	Difference: 41 Watts (273%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 440 1.5GB is 170% faster than the GeForce 820M overall, because of its greater data rate. (explain)

GeForce GT 440 1.5GB		43200 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 27200 (170%)

Texel Rate

The GeForce GT 440 1.5GB should be much (approximately 24%) better at AF than the GeForce 820M. (explain)

GeForce GT 440 1.5GB		14256 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 2752 (24%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 440 1.5GB is the winner, by a large margin. (explain)

GeForce GT 440 1.5GB		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 max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in a 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 - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.