GeForce 820M vs GeForce GTS 150

Intro

Compare all of that to the GeForce GTS 150, which comes with GPU core speed of 740 MHz, and 1024 MB of GDDR3 memory set to run at 500 MHz through a 256-bit bus. It also is comprised of 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTS 150		141 Watts
	Difference: 126 Watts (840%)

Memory Bandwidth

Theoretically, the GeForce GTS 150 should perform much faster than the GeForce 820M overall. (explain)

GeForce GTS 150		32000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTS 150 is quite a bit (approximately 312%) better at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTS 150		47360 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 35856 (312%)

Pixel Rate

The GeForce GTS 150 should be a lot (approximately 312%) better at AA than the GeForce 820M, and also will be capable of handling higher screen resolutions better. (explain)

GeForce GTS 150		11840 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 8964 (312%)

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 MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.