Sam - I bought a liteon DVD writer but not a dual layer one. It stated on the box that the spec was a 500Mhz P3, I'm useing a 350mhz P2 and it still works ok. No doubt it doesnt burn at the quoted speed but it works ok.
Sorry sam, it is possible it will work as it will depend on what you want to do with it. I would suggest that the speed they say you need is very conservative as they want to sell their DVD writer, its more likely that you'll need something like a 600mhz or above to really get any use out of it. If you want to use the DVD writer for anything to do with video them forget it as your PC is just not fast enough. If its for backing up files etc then it may work but having never seen anyone with a DVD writer in a PC of this speed then I can't comment further. If its for backing up files etc then what about a CD writer they are very cheap.
Stuartli I know that a DVD writer can burn CDs as well but wasn't sure that they would actually run on a 400mhz PC seeing as they ask for a 450mhz. However as Mark10 has said his DVD writer works ok so there you are. Wonder why they say it needs a 450 if it'll run on a 350? Could it be something to do with being able to burn video DVDs?