Confused about nVidia GPU (810M and 820M)

[smarko1983]

I am buying a laptop and I got confused regarding the GPU. What is the difference between GeForce 810M and 820M mobile GPU? Why isn't the 810M even listed on nvidia website? I looked at this link on your website and there was no 810M ( http://www.geforce.com/hardware/notebook-gpus?keys=&field_gpu_series_value=800 ) while on your driver's page it is clearly listed: http://www.geforce.com/drivers

Why is 820M so much better then 810M when they have exactly the same specifications?! ( http://gpuboss.com/gpus/GeForce-820M-vs-GeForce-810M )
Please clafiry this, thank you

 

[popatim]

GT 810M is an OEM chip used on a few notebooks.
I think GT 820M is slightly higher clocked than 810M. Both have same core count (96 Fermi cores).

 

[smarko1983]

What makes you think that? Where did you find that information?