GeForce 820M vs GeForce GTX 660 Ti

Intro

Compare all of that to the GeForce GTX 660 Ti, which makes use of a 28 nm design. nVidia has clocked the core speed at 915 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this card. It features 1344 SPUs as well as 112 Texture Address Units and 24 ROPs.

Display Graphs

Hide Graphs

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 660 Ti		6013 points
GeForce 820M		850 points
	Difference: 5163 (607%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 135 Watts (900%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti should perform much faster than the GeForce 820M overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 128000 (800%)

Texel Rate

The GeForce GTX 660 Ti should be much (approximately 791%) better at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 90976 (791%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 Ti is superior to the GeForce 820M, by a large margin. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 19084 (664%)

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 maximum amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.