GeForce 820M vs GeForce 8800 GT 1GB

Intro

Compare those specs to the GeForce 8800 GT 1GB, which uses a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 memory works at a speed of 900 MHz on this card. It features 112 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 8800 GT 1GB		105 Watts
	Difference: 90 Watts (600%)

Memory Bandwidth

The GeForce 8800 GT 1GB should theoretically perform quite a bit faster than the GeForce 820M in general. (explain)

GeForce 8800 GT 1GB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 8800 GT 1GB should be much (more or less 192%) more effective at AF than the GeForce 820M. (explain)

GeForce 8800 GT 1GB		33600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 22096 (192%)

Pixel Rate

The GeForce 8800 GT 1GB will be a lot (about 234%) better at AA than the GeForce 820M, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce 8800 GT 1GB		9600 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 6724 (234%)

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 (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.