GeForce 820M vs GeForce GTX 950M

Intro

Compare all of that to the GeForce GTX 950M, which has GPU clock speed of 914 MHz, and 2048 MB of DDR3 memory running at 1000 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 TAUs, 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 GTX 950M		3330 points
GeForce 820M		850 points
	Difference: 2480 (292%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 950M		55 Watts
	Difference: 40 Watts (267%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 950M should be 100% faster than the GeForce 820M in general, due to its higher data rate. (explain)

GeForce GTX 950M		32000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTX 950M will be a lot (about 218%) better at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 950M		36560 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 25056 (218%)

Pixel Rate

The GeForce GTX 950M will be a lot (more or less 408%) faster with regards to full screen anti-aliasing than the GeForce 820M, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 950M		14624 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11748 (408%)

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 max amount of data (measured in MB 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 its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.