GeForce 820M vs GeForce 8800 GTS (G80) 320MB

Intro

Compare those specifications to the GeForce 8800 GTS (G80) 320MB, which has core speeds of 513 MHz on the GPU, and 792 MHz on the 320 MB of GDDR3 memory. It features 96 SPUs along with 48 Texture Address Units and 20 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 128 Watts (853%)

Memory Bandwidth

The GeForce 8800 GTS (G80) 320MB should theoretically be a lot faster than the GeForce 820M overall. (explain)

GeForce 8800 GTS (G80) 320MB		63360 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 47360 (296%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB will be a lot (approximately 114%) better at AF than the GeForce 820M. (explain)

GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 13120 (114%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 8800 GTS (G80) 320MB is the winner, and very much so. (explain)

GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 7384 (257%)

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 max amount of data (in units of megabytes per second) that can be transported 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. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 get to the max fill rate.