Yamaha.
DONT FORGET that a cd drive is only as fast as the computer that it is in. if the cpu cant get data to the drive fast enough it wont matter what speed drive you get.. Also, dont try to jump your processor by using an evergreen processor, they are real shady, you still have a slow old motherboard. I have gotten the 233 to work on p75-166 but the 400 wouldnt even work on 333's so be careful, you will start to notice a lot of video problems at first. . I would say not to get a cdrw and get a new computer, even with an upgrade, using ide, you probably wont max more than 2x burns, but good luck, and as a tip, disable all antivirus and run nothing in the background when making cd's. the anti virus, scans the temp file that is created and slows it down by like 2-300kbs