GeForce 820M vs GeForce GTX 590

Intro

Compare those specifications to the GeForce GTX 590, which uses a 40 nm design. nVidia has set the core frequency at 607 MHz. The GDDR5 memory works at a frequency of 855 MHz on this model. It features 512 SPUs as well as 64 Texture Address Units and 48 Rasterization Operator Units.

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 590		6680 points
GeForce 820M		850 points
	Difference: 5830 (686%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 590		365 Watts
	Difference: 350 Watts (2333%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 590 should be 1952% quicker than the GeForce 820M overall, because of its greater data rate. (explain)

GeForce GTX 590		328320 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 312320 (1952%)

Texel Rate

The GeForce GTX 590 is quite a bit (about 575%) faster with regards to AF than the GeForce 820M. (explain)

GeForce GTX 590		77696 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 66192 (575%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 590 is superior to the GeForce 820M, by a large margin. (explain)

GeForce GTX 590		58272 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 55396 (1926%)

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: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.