GeForce 820M vs GeForce 8800 GT 512MB

Intro

Compare that to the GeForce 8800 GT 512MB, which makes use of a 65 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 RAM runs at a frequency of 900 MHz on this specific card. It features 112 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 90 Watts (600%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GT 512MB should theoretically be a lot superior to the GeForce 820M overall. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 8800 GT 512MB should be quite a bit (approximately 192%) better at AF than the GeForce 820M. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 22096 (192%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 8800 GT 512MB is superior to the GeForce 820M, by a large margin. (explain)

GeForce 8800 GT 512MB		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: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could 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 colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.