GeForce 820M vs GeForce GTS 150

Intro

Compare all of that to the GeForce GTS 150, which uses a 55 nm design. nVidia has set the core frequency at 740 MHz. The GDDR3 memory works at a speed of 500 MHz on this particular card. It features 128 SPUs along with 64 Texture Address Units and 16 Rasterization Operator 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 be quite a bit 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 will be quite a bit (more or less 312%) faster with regards to 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 is much (more or less 312%) more effective at FSAA than the GeForce 820M, and also 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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.