os3.9 NOROMUPDATE?

[Dr.Bongo]

Upgraded the memory in my A4k (the one in my sig) to 128mb. After which it refused to boot only giving a software failure. WB 3.1 and classic WB are fine with it though, both show 128mb fast mem.
 The only way I can seem to get 3.9 to work is to Add NOROMUPDATE to the startup-sequence.

 Everything seems fine and speedy like that but my question is - Will having that in my startup-sequence make a negative difference?

[Dr.Bongo]

Cheers for that. I kind of knew most of it, but your reply was quite in-depth.

I can't seem to notice a difference in performance or features, I just wondered If anyone has been through similar and can say if it really matters or makes a difference to add NOROMUPDATE?