GeForce 820M vs GeForce GTX 580

Intro

Compare all of that to the GeForce GTX 580, which features a GPU core clock speed of 772 MHz, and 1536 MB of GDDR5 memory running at 1002 MHz through a 384-bit bus. It also features 512 Stream Processors, 64 Texture Address Units, and 48 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 580		4956 points
GeForce 820M		850 points
	Difference: 4106 (483%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 580		244 Watts
	Difference: 229 Watts (1527%)

Memory Bandwidth

The GeForce GTX 580 should in theory be a lot faster than the GeForce 820M in general. (explain)

GeForce GTX 580		192384 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 176384 (1102%)

Texel Rate

The GeForce GTX 580 will be a lot (more or less 329%) more effective at AF than the GeForce 820M. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 37904 (329%)

Pixel Rate

The GeForce GTX 580 will be quite a bit (approximately 1188%) better at full screen anti-aliasing than the GeForce 820M, and able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 34180 (1188%)

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 data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling 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 a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.