GeForce 820M vs GeForce GT 340 1GB

Intro

Compare those specs to the GeForce GT 340 1GB, which comes with a core clock speed of 550 MHz and a GDDR5 memory frequency of 850 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 96 SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GT 340 1GB		69 Watts
	Difference: 54 Watts (360%)

Memory Bandwidth

The GeForce GT 340 1GB should in theory perform a lot faster than the GeForce 820M in general. (explain)

GeForce GT 340 1GB		54400 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 38400 (240%)

Texel Rate

The GeForce GT 340 1GB should be quite a bit (about 53%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

GeForce GT 340 1GB		17600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 6096 (53%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GT 340 1GB is superior to the GeForce 820M, by a large margin. (explain)

GeForce GT 340 1GB		4400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 1524 (53%)

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 maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.