GeForce 820M vs GeForce GTS 450

Intro

Compare those specs to the GeForce GTS 450, which features GPU clock speed of 783 MHz, and 512 MB of GDDR5 memory set to run at 902 MHz through a 128-bit bus. It also is comprised of 192 SPUs, 32 Texture Address Units, and 16 Raster Operation 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 GTS 450		1453 points
GeForce 820M		850 points
	Difference: 603 (71%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTS 450		106 Watts
	Difference: 91 Watts (607%)

Memory Bandwidth

Theoretically, the GeForce GTS 450 should be much faster than the GeForce 820M in general. (explain)

GeForce GTS 450		57728 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41728 (261%)

Texel Rate

The GeForce GTS 450 should be much (about 118%) better at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 13552 (118%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTS 450 is the winner, by a large margin. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 9652 (336%)

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 (in units of megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's bus 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 ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.