GeForce 820M vs GeForce 8800 Ultra

Intro

Compare those specs to the GeForce 8800 Ultra, which comes with a clock frequency of 612 MHz and a GDDR3 memory speed of 1080 MHz. It also features a 384-bit memory bus, and makes use of a 90 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 8800 Ultra		171 Watts
	Difference: 156 Watts (1040%)

Memory Bandwidth

In theory, the GeForce 8800 Ultra should be 548% faster than the GeForce 820M in general, because of its higher data rate. (explain)

GeForce 8800 Ultra		103680 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 87680 (548%)

Texel Rate

The GeForce 8800 Ultra is a lot (approximately 240%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

GeForce 8800 Ultra		39168 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 27664 (240%)

Pixel Rate

The GeForce 8800 Ultra is much (approximately 411%) more effective at full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce 8800 Ultra		14688 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11812 (411%)

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 (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the 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 sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.