I find my 420 has enough power for medium complex projects (as of my measurement) - if I restrict myself on renoise native or cpu friendly plugins. Like when on my hexacore workstation things eat 40% cpu on the laptop the same project is on 70%. So it is not really that crippeled or restrained to some simple amen choppings, you can do much more with such a machine. 410 should be approaching the same cpu power, maybe it will produce more heat and eat the battery charge a bit faster.
Yes the soundcard isn't the bomb, it barely drives my 250 ohm open headphones so that I can work in quiet environments, but yes, it need to crank up fully and cannot really sacrifice some db for a bass boost like I would when working with a headphone amp. You can always upgrade with a nice usb dac with stronger headphone amp an better sound quality. Or use <=80 ohm headphones.
If you plan trying to work on battery without wall power, you will also have to consider investment of a new/fresh battery for the laptop. When you buy the things used, they will most probably come with a used battery that is completely worn down and only has 30-40% of the original capacity left, only suited to transport the laptop for short time while in suspend mode.
Edited by Zer0 Fly, 02 July 2018 - 16:51.