Then you need another 8x1.
As for your SSD go investigate what your motherboard manual says, however as long as the drive isn't defective I can not see it affecting gaming performance.
Also check what things you have running in the background, there could be something that is causing interim load on your CPU or something. Try for instance if running the game right after booting makes a difference.
Finally how about cooling. Are all fans running and have you checked the machine isn't full of dust - checking 1-2 times a year is a good routine.