GeForce 820M vs GeForce GTX 260 216SP 55 nm

Intro

Compare that to the GeForce GTX 260 216SP 55 nm, which has core clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 RAM. It features 216 SPUs along with 72 Texture Address Units and 28 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 156 Watts (1040%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 260 216SP 55 nm should be 599% faster than the GeForce 820M in general, due to its higher bandwidth. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 216SP 55 nm is a lot (about 261%) more effective at anisotropic filtering than the GeForce 820M. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 29968 (261%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 260 216SP 55 nm is a better choice, and very much so. (explain)

GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 13252 (461%)

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 (counted in MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number is calculated by multiplying the total amount of texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 maximum fill rate.