**Update**
Its a 8X4X24 IDE.
It now seems to burn off the H/D at 8X ok. Well it did on two H/D copies. But if I try to copy a CD to CD-R X8 I get Underbuffer Errors! I did try burning one at X2, but thats what I'm upgradeing from! :| It did however burn GOOD. At X8 it gets to 60%-90% then it gets underbuffer errors. Could it be my 50X Acer CD-Rom cant keep up at 8X speed? I also installed the Yamaha Burner in another computer that has a 40X Acer CD-Rom and still I get Underbuffer errors. But I could copy off the H/D on both computer and Burn ok at 8X. The only thing I can think is the matter is neither of the Acer CD-Roms can keep up at 8X speed with the yamaha burner, its that possable? If so i just cant believe it cant stay consistent at only 8X to stay up with the Yamaha Burner. I'm thinking about sending it back and getting a Plextor drive. But it would be a waste of time if its my Acer CD-Rom being the problem or two slow.
BTW...DMA is Unchecked its a IDE burner. Also i was finally able to get the software to installed fully after 5 attempts!
Running Win98
Primary:
Master - Maxtor 20GIG
Slave - W/D 8GIG
Secondary
Master - Acer 50X
Slave - Yamaha 8X4X24X IDE
Maybe switch my Yamaha to the secondary Master maybe? But it says in the book it should be fine set as the slave.
What would to do or try?

Thanks Guys!