A motherboard needs to manage all the ram sticks with the same voltage, speed and timings.
If you have the sticks, try them.
If you are buying more ram, consider buying one matched kit.
Ram vendors will not support mixed ram. You are on your own there.
Yeahh your right. I think i will buy it on the same vendor with the same specification next time. I just use the other Stick on my other Desktop hehehe
I thought it will not work cause somebody told me that different RAM specs wont work. Including Frequency and Latency.