Upgrade H10A to H10N JJ11 using 80 flat cabe (UDMA4) is more fast than UDMA2?
in theory yes, in practice no.
It depends on what you mean by “more fast”. If you mean will it make an 8x disc burn at 9x, then no. Data is transferred faster to and from the drive but it will probably only make a difference if you do a disc to disc copy on the fly from one DVD writer to another.
I have both UDMA 4 drives and UDMA 2 drives and they both write at close to 16X, I really do not see much of a difference, (except as was said above in “On the Fly” backups).