Even QLC SSD's are leaps and bounds better than hard drives. There's not much reason to have HDD's at all, aside of offline backup/cold storage backup. (e.g. backup and then throw in drawer or fireproof safe, or offsite)... Remember, the hard drive is always the slowest part of the computer. If you can afford the software to fill them with, you can afford an SSD. Even if it's just a 'Silicon Power' sata SSD, doesn't matter, it's still going to be much better performing than a hard drive. Having a newer processor (from anything north of x58 series), and hooking it to a hard drive, you might as well run a core 2 duo buddy. You will enjoy the greener pasture and everytime you hit a load screen and it's gone quickly, you will thank yourself. That said keep old HDD's for backups.