As long as you install ram so that its in dual channel your fine. What motherboard do you have?
Also, you really can't install windows on a drive in one pc and transfer it to another pc without issues since hardware is different. You'll have to reinstall windows while the drive is inside the system it is intended for.
That's the thing, it's not in dual channel. I did not follow the population priority order indicated in the motherboard. Look the motherboard up. I installed in DDR3_A1 and DDR3_A2. Recommendation is DDR3_A2 and DDR3_B2. It didn't work that way.
ASRock FM2A88X PRO3+ and 2 Kingston Fury X 4Gb 1866Mhz.