Registered: Apr 2010
Location: Continental USA
Distribution: Debian, Ubuntu, Fedora, RedHat, DSL, Puppy, CentOS, Knoppix, Mint-DE, Sparky, Vsido, tinycore, Q4OS
Almost any new machine you purchase, server class or not, is likely to be far faster than your available network speed.
Ho well it will serve depends upon what you plan to do with it.
I have run web servers on much smaller pipes than that and no one could complain about speed.
(Using hand-edited HTML with CSS, XITAMI or LIGHTTPD software, little CGI, few small graphics, and coding for efficiency.)
For an SFTP or FTP server a thin pipe has more impact, but for many things your are not passing large enough files to hit the wall unless your load goes /. on you.