And thank you Lydia. I just upgrade the server to 16GB and it runs so fast. Without Lydia though it could have gone so badly, because I forgot to fefit the fan inside the case. It would have taken seconds for the server to overheat, but luckily Lydia spotted my oversight.
I placed two order. Both of them were promised in 2/3 days, and both arrived next day. Am so grateful for my poor overloaded server.