GeForce 820M vs Radeon HD 5670

Intro

Compare all that to the Radeon HD 5670, which features GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 400(80x5) Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5670		61 Watts
	Difference: 46 Watts (307%)

Memory Bandwidth

Performance-wise, the Radeon HD 5670 should in theory be quite a bit superior to the GeForce 820M overall. (explain)

Radeon HD 5670		64000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 48000 (300%)

Texel Rate

The Radeon HD 5670 should be a lot (more or less 35%) faster with regards to AF than the GeForce 820M. (explain)

Radeon HD 5670		15500 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 3996 (35%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5670 is a better choice, by far. (explain)

Radeon HD 5670		6200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 3324 (116%)

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 (measured in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.