GeForce 820M vs Radeon HD 5830

Intro

Compare all of that to the Radeon HD 5830, which has a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is comprised of 1120(224x5) Stream Processors, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5830		175 Watts
	Difference: 160 Watts (1067%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 should perform a lot faster than the GeForce 820M overall. (explain)

Radeon HD 5830		128000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The Radeon HD 5830 should be a lot (more or less 289%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon HD 5830		44800 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 33296 (289%)

Pixel Rate

The Radeon HD 5830 will be much (more or less 345%) better at anti-aliasing than the GeForce 820M, and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 5830		12800 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 9924 (345%)

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 MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be 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 higher 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 number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.