Welp, I was wrong, changing the port had a drastic effect. It isn't near what it should be, but it's serviceable. The OS SSD is now the only drive on the Intel 6Gb/s port(s); it had slight gains on...

Also having this issue. 8 second to 2 minute startup, one or the other at random. Since the OS drive is an SSD I have quite a lot of programs using both drives and it's really been interfering with...

Sounds like one of two possible scenarios:
1) your previous power supply wasn't regulating voltage properly.
2) your RAM wasn't set up properly in BIOS. Undervoltage on RAM will lead to random...