Hello, I am on look for write speed free bios!
that is called I would like a 4X dvd also with 8 X to burn to be able!
for my old 2510 I had such a thing 
A speed free bios doesn’t make a lot of sense, since for example thats the same as saying it could be set at 4x or 1000x ?
Therefore best speed (free) bios for you to try at present is the Liggy and Dee Modified firmware Beta 3,
Especially with that low mediaprices today it isn’t that important anymore…