I hate to add to this thread so late, but since I have a lot of first hand experience of installing a CD-R in a system of that era in that era, let me share what I know.
First, you will want that Yamaha drive. It was the pinnacle of CD-Rs at the time and was THE drive to have for many years. You will need to make sure you have a caddy as it is a caddy-based drive. DO NOT settle for anything less than a caddy.
Second, sustaining enough continuous K/sec to the drive to write at 4x will be a challenge and next to impossible unless you're going all SCSI for your storage and accessories. IDE used the CPU for transfers which would make the CPU spike whereas SCSI didn't. In other words, your CPU would get pegged reading from the IDE drive and the SCSI CD-R wouldn't get the data it needed fast enough. With full SCSI, especially SCSI-2 since it supported disconnect/reconnect, your chances of a butter underrun (as it was known back in the day) becomes much less.
But even with full SCSI, do not expect to even run a screensaver without having a buffer underrun. The system our Yamaha is installed in is a Cyrix P166 based system with an Adaptec 2940UW or 3940UW (whichever one had dual SCSI channels). We put the CD-R as well as accessory drives like the Plextor CD-ROM and SyJet and Jazz drives on one channel with the MYLEX DAC960SUI SCSI-SCSI RAID controller on the other with 3 9GB Seagate 2nd generation Cheetah drives attached to it. The drives could sustain about 10MB/sec in DOS. For 4x writing you needed 600K/sec, and to be safe, you needed at least double that. On this system, we could write a CD with relatively little worry, but the stock starfield screensaver under Win 3.1 still could reduce the buffer (ie buffer wasn't 100% full).
Third, use superior media. After trying our hand with Sony media (which I wonder if it can be ready today), we moved to Mitsui (MAM-A) media. Even today, Mitsui (MAM-A) gold is still by far the best media money can buy and the Yamaha drive loved the media.
It will be quite cool to see a 486 write at 4x, but I highly doubt you'll be able to do it. Our 486dx2-66 could barely sustain 1MB/sec and it was full SCSI as well.