need to run 2. 52 speed cd writers on the fly while burning dvds with the 4 speed pioneer.without everything locking up nero is fine for the cdrs.shall i use nero for the dvd writer too.need advice about upgrade or tower unit spec.thanx.

Move to Consumers forum ...

Sounds like it would be less demanding on the system if you would create the first CDR then just simply copy it on the fly. Or create an image on the drive the burn with multiple burners. I'm not sure of what you are doing or what format you are burning to the CDRs.
Anyway, although Nero has made strides in CPU cyles managability when useing multiple burners, I hear Diskjuggler is the product to use. For Nero, you would need a version (or serial number) that support multiple burners.