Will I get same speed from a dedicated server after buying?

[sukhidas]

Hello all members,
I was searching a dedicated server for our official website (We do provide web design services, as members regularly upload and download jpg,png,psd files, we need dedicated server). Whenever I find a new host, I try to test dedicated server speed by downloading sample files. Recently, I have tested atlantic.net dedicated server speed, but how can I be sure that this speed will remain same for my server (after buying)? This is first time that we are going to try dedi, so need help on this.

Here is the link from where I have tested dedi speed:
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