GeForce 820M vs GeForce GT 340

Intro

Compare those specs to the GeForce GT 340, which comes with clock speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 RAM. It features 96 SPUs along with 32 TAUs and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce GT 340 should theoretically perform quite a bit faster than the GeForce 820M in general. (explain)

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

Texel Rate

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

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GT 340 is a better choice, by far. (explain)

GeForce GT 340		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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure 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 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 that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill 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 get to the max fill rate.