In my opinion, adding Chip RAM is never
going to hurt anything at all. Only if you start to upgrade your KS or upgrade some of the other custom chips to ECS could you potentially see compatibility issues with some software. That being said, before soldering RAM to your MB, it's worth keeping an eye out for a MegaChip
It's a little board that presses into the Agnus socket, and a 2MB Agnus sits inside it. It looks like this
I use one of these in my A2000 and it is flawless. Very easy to install as well (once you've torn the machine apart, that is).
So you'd only have to source the little board and the Super Fat Agnus, and they usually come together. There's one on Ebay right now
, as a matter of fact.
In addition, adding an MKL 8MB (fast) RAM
upgrade that lives right below the 68000 processor (and only costs ~$50) and you'd have a smokin' machine (smokin' in a good way).