The original Phat PS2 models support internal IDE disks, though it's easy to convert them to SATA with an inexpensive adapter. Then prepare the SSD and install (I use WinHIIP, "obsolete" but works fine). It noticably improves startup and load times in games!
Some also swap the fan for a Noctua to give it a complete "quiet upgrade", but my stock fan isn't very loud.
Some also swap the fan for a Noctua to give it a complete "quiet upgrade", but my stock fan isn't very loud.