And..... there are other opinions. This likely is worth watching, from another post just added today, HERE.
https://www.youtube.com/watch?v=jpmhfVZiG48
Not sure what processor you have, but you can upgrade that too.
The Elite 8300 can run SATA III drives..... I'd for sure want one of those for my boot/applications (games) drive in addition to dropping total power usage some. I also put in a HP SFF eSATA adapter for the backplane and convert the proper internal SATA port to eSATA via BIOS. We use eSATA here for fast cloning/backup.
Finally, there is a worthwhile Lenovo thread, HERE. Make sure the card you use not only is the low profile, but not too long for the inside space available to you. Maximum memory performance will come from populating all 4 slots with identical RAM.... 4 x 2GB vs 4 x 4GB, and use the fastest MHz RAM that will match your chosen processor.