GeForce 820M vs GeForce GTS 150

Intro

Compare those specs to the GeForce GTS 150, which has GPU core speed of 740 MHz, and 1024 MB of GDDR3 RAM set to run at 500 MHz through a 256-bit bus. It also is comprised of 128 SPUs, 64 TAUs, 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 speaking, the GeForce GTS 150 should be much faster than the GeForce 820M in general. (explain)

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

Texel Rate

The GeForce GTS 150 should be a lot (about 312%) faster with regards to AF than the GeForce 820M. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTS 150 is superior to the GeForce 820M, and very much so. (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 max amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.