RAM sticks with different size will work?

[AKESSON]

So I was going to play COD GHOSTS but it said that I couldn't play it because I didnt hade the required RAM memory. Anyways I bought a new stick that comes tomorrow or on friday. So my question is: Will the mix work? I'll put all the information you need to help me down below.
Thanks in advance

Motherboard: MSI P55-CD53
RAM Sticks in my computer: Kingston ValueR, DDR3, 1333MHz, 4GB ( 2 sticks with 2 GB on each) and CL9.
RAM stick I ordered: Kingston ValueR, DDR3, 1333MHz, 4GB, Non-ECC, CL9 and DIMM
Total RAM memory without the new stick: 4GB
Total RAM memory with the new stick: 8Gb
So basically the same sticks but different sizes on each so will it work?

 

[matt_b]

Most motherboards like to see pairs installed when using two or more RAM sticks. Speeds match with what you have and ordered, otherwise the slowest is the default speed for both of them. At the very least, you give up having dual channel throughput capability by using only three. It should work, if it does not (small chance however), then ordering another stick of what you just ordered would restore compatibility.

 

[AKESSON]

Most motherboards like to see pairs installed when using two or more RAM sticks. Speeds match with what you have and ordered, otherwise the slowest is the default speed for both of them. At the very least, you give up having dual channel throughput capability by using only three. It should work, if it does not (small chance however), then ordering another stick of what you just ordered would restore compatibility.

Thank you, will order one more if it would be needed