GeForce 820M vs Radeon HD 5870

Intro

Compare those specifications to the Radeon HD 5870, which comes with GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5870		188 Watts
	Difference: 173 Watts (1153%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5870 should perform quite a bit faster than the GeForce 820M in general. (explain)

Radeon HD 5870		153600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 137600 (860%)

Texel Rate

The Radeon HD 5870 should be a lot (approximately 491%) faster with regards to anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 5870		68000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 56496 (491%)

Pixel Rate

The Radeon HD 5870 is quite a bit (more or less 846%) better at AA than the GeForce 820M, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5870		27200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 24324 (846%)

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 information (counted in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. 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 rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.