GeForce 820M vs Radeon HD 5850

Intro

Compare those specifications to the Radeon HD 5850, which has clock speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 1440(288x5) SPUs along with 72 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5850		151 Watts
	Difference: 136 Watts (907%)

Memory Bandwidth

The Radeon HD 5850 should theoretically be quite a bit faster than the GeForce 820M overall. (explain)

Radeon HD 5850		128000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The Radeon HD 5850 should be quite a bit (more or less 354%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 5850		52200 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 40696 (354%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5850 is superior to the GeForce 820M, by far. (explain)

Radeon HD 5850		23200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 20324 (707%)

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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video 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 number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.