GeForce 820M vs GeForce GT 340 1GB

Intro

Compare those specifications to the GeForce GT 340 1GB, which comes with a GPU core clock speed of 550 MHz, and 1024 MB of GDDR5 RAM running at 850 MHz through a 128-bit bus. It also is comprised of 96 Stream Processors, 32 TAUs, 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 theoretically be much faster than the GeForce 820M overall. (explain)

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

Texel Rate

The GeForce GT 340 1GB will be a lot (more or less 53%) better at 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 resolution is important to you, then the GeForce GT 340 1GB is the winner, 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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of 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 maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.