GeForce 820M vs GeForce GTS 450

Intro

Compare all of that to the GeForce GTS 450, which has a core clock speed of 783 MHz and a GDDR5 memory frequency of 902 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 192 SPUs, 32 Texture Address Units, and 16 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 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

In theory, the GeForce GTS 450 is 261% faster than the GeForce 820M overall, because of its higher data rate. (explain)

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

Texel Rate

The GeForce GTS 450 is a lot (more or less 118%) better at AF than the GeForce 820M. (explain)

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

Pixel Rate

The GeForce GTS 450 is quite a bit (more or less 336%) better at anti-aliasing than the GeForce 820M, and also should be capable of handling higher screen resolutions while still performing well. (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 largest amount of data (measured in megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 per 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 number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.