GeForce 820M vs Radeon HD 5970

Intro

Compare all that to the Radeon HD 5970, which features GPU clock speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also features 1600 Stream Processors, 160 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5970		294 Watts
	Difference: 279 Watts (1860%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5970 should be 1500% quicker than the GeForce 820M overall, due to its greater bandwidth. (explain)

Radeon HD 5970		256000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 240000 (1500%)

Texel Rate

The Radeon HD 5970 is much (approximately 1917%) more effective at anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 5970		232000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 220496 (1917%)

Pixel Rate

The Radeon HD 5970 is quite a bit (more or less 3127%) faster with regards to FSAA than the GeForce 820M, and also able to handle higher resolutions while still performing well. (explain)

Radeon HD 5970		92800 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 89924 (3127%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 are processed per second. This figure 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 video 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 most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.