GeForce 820M vs Geforce GTX 670

Intro

Compare all of that to the Geforce GTX 670, which has a core clock frequency of 915 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 32 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 670		7351 points
GeForce 820M		850 points
	Difference: 6501 (765%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Geforce GTX 670		170 Watts
	Difference: 155 Watts (1033%)

Memory Bandwidth

The Geforce GTX 670 should theoretically perform much faster than the GeForce 820M in general. (explain)

Geforce GTX 670		192000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 176000 (1100%)

Texel Rate

The Geforce GTX 670 is a lot (more or less 791%) more effective at texture filtering than the GeForce 820M. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 90976 (791%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 670 is a better choice, by a large margin. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 26404 (918%)

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 maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.