The only difference between an OEM product (more usually supplied to system builders) is that they don't come in a fancy box, graphics cards for instance will have no drivers and there will be no software.
You don't need a driver for a rewriter or CD/DVD-ROM drive, you can get firmware from the manufacturer's website, there's plenty of suitable freeware software and you don't need a fancy box, so save money...:-)
I wish there was an easy way to tell everyody to visit click here This website will answer a lot of queries posted on this forum including this one.Having said all that the site was down yesterday and I haven't tried today yet
OEM graphics cards are normaly clocked lower than there retail counterparts BTW.
As the Liteon burner i mentioned is a retail box that comes with a 4x DVD+R a 4X DVD+RW and the burnining software but cost only 90 quid do you still think it is not worth it? Buying a dual format writer isnt worth it, -R is a dead duck in the water.