GeForce 820M vs GeForce 9800 GT 1GB

Intro

Compare those specs to the GeForce 9800 GT 1GB, which comes with a core clock speed of 600 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit bus, and uses a 65/55 nm design. It features 112 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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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

Theoretically speaking, the GeForce 9800 GT 1GB will be 260% quicker than the GeForce 820M in general, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce 9800 GT 1GB will be much (about 192%) more effective at anisotropic filtering than the GeForce 820M. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the GeForce 9800 GT 1GB is a better choice, by a large margin. (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 maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 can be processed in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher 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 amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.