GeForce 820M vs GeForce GTX 260

Intro

Compare that to the GeForce GTX 260, which comes with a GPU core clock speed of 576 MHz, and 896 MB of GDDR3 RAM set to run at 999 MHz through a 448-bit bus. It also is comprised of 192 SPUs, 64 Texture Address Units, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 260		182 Watts
	Difference: 167 Watts (1113%)

Memory Bandwidth

The GeForce GTX 260, in theory, should perform much faster than the GeForce 820M in general. (explain)

GeForce GTX 260		111888 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 will be much (more or less 220%) more effective at AF than the GeForce 820M. (explain)

GeForce GTX 260		36864 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 25360 (220%)

Pixel Rate

The GeForce GTX 260 will be much (more or less 461%) more effective at FSAA than the GeForce 820M, and also will be able to handle higher screen resolutions better. (explain)

GeForce GTX 260		16128 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 13252 (461%)

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 information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total number of texture units by the core 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 maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.