GeForce 820M vs Radeon HD 5570

Intro

Compare all that to the Radeon HD 5570, which makes use of a 40 nm design. AMD has clocked the core frequency at 650 MHz. The DDR3 memory works at a frequency of 900 MHz on this specific model. It features 400(80x5) SPUs as well as 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5570		43 Watts
	Difference: 28 Watts (187%)

Memory Bandwidth

In theory, the Radeon HD 5570 will be 80% faster than the GeForce 820M overall, because of its higher bandwidth. (explain)

Radeon HD 5570		28800 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 12800 (80%)

Texel Rate

The Radeon HD 5570 will be a bit (about 13%) faster with regards to texture filtering than the GeForce 820M. (explain)

Radeon HD 5570		13000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 1496 (13%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 5570 is superior to the GeForce 820M, by far. (explain)

Radeon HD 5570		5200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 2324 (81%)

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 largest amount of data (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.