September 04, 2015, 12:02:53 pm
I am not in a situation where I have access to a comparable desktop GTX 780 to compare.
I can say though, that laptop PC's because they have graphics cards designed for the mobile environment (mostly power requirement constraints) are generally about 30 to 40 percent less powerful than their counterpart desktop.
Have a look at the Passmarks
for various laptops such as the 980M (6247), and compare that to the desktop 980 (9719).
Unfortunately it's the way it is with hardware. However, as you are buying in to the current hardware release series, you are getting access to the fastest mobile devices in the GTX 980M's. If you need mobility, then you need mobility.
What is also important is that the laptop meets the needs of the types of scenes you are going to be using it for.
If not done so, please also refer to our guides on hardware:
1. LUMION 5: Minimum hardware requirements
2. Lumion Web Site: Specifications
3. Passmark: Videocard Benchmarks
Web site Guide: Hardware for Lumion
Please note that the above does not mean that I or Act-3D endorse specific products. We are unable to offer any guarantees regarding the expected performance in Lumion with the above-mentioned hardware, and you cannot hold us liable for any costs or damages incurred if you purchase hardware based on our posts on this forum or via email.