GeForce 820M vs GeForce 9800 GT 1GB

Intro

Compare that to the GeForce 9800 GT 1GB, which makes use of a 65/55 nm design. nVidia has clocked the core speed at 600 MHz. The GDDR3 memory works at a frequency of 900 MHz on this card. It features 112 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 90 Watts (600%)

Memory Bandwidth

The GeForce 9800 GT 1GB should in theory be quite a bit faster than the GeForce 820M overall. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 9800 GT 1GB should be a lot (more or less 192%) better at texture filtering than the GeForce 820M. (explain)

GeForce 9800 GT 1GB		33600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 22096 (192%)

Pixel Rate

The GeForce 9800 GT 1GB is a lot (approximately 234%) more effective at FSAA than the GeForce 820M, and also should be able to handle higher resolutions more effectively. (explain)

GeForce 9800 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: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, 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 AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.