Welcome to the forums, newcomer!
On the topic of adding ram to your build, Corsair is the only brand out there that sources IC's from multiple vendors. It's for this reason they have PCB revision numbers for their ram kits. You will need to drop in the exact same stick of ram and I don't mean something that's visually similar(with their heatsinks and PCB color) but the PCB revision number as well, so you're working with the same IC's.
If you can't, you're best off dropping in a new ram kit.
You should add more info to your thread by including the following:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.
Perhaps you can drop in something better than what you already have while you're at it.