GeForce 820M vs GeForce 9800 GT 512MB

Intro

Compare all of that to the GeForce 9800 GT 512MB, which has a clock speed of 600 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 65/55 nm design. It is comprised of 112 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 9800 GT 512MB		105 Watts
	Difference: 90 Watts (600%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GT 512MB should in theory be much better than the GeForce 820M in general. (explain)

GeForce 9800 GT 512MB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The GeForce 9800 GT 512MB should be a lot (more or less 192%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce 9800 GT 512MB		33600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 22096 (192%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 9800 GT 512MB is superior to the GeForce 820M, by far. (explain)

GeForce 9800 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: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, 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 most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units 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 also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.