Issue:
/proc/cpuinfo says I'm running "AMD Opteron(tm) Processor 3280" at 1400 MHz. You advertised this server at 2400 MHz. Are you underclocking it, or am I getting bad info?


Answer:
this is probably default "power saving" CPU function on Ubuntu OS when Your CPU is not maxed out.



You may try this:
http://ubuntuforums.org/showthread.php?t=855675&p=9982116#post9982116
http://ubuntuforums.org/showthread.php?t=1940112&p=11761058#post11761058
http://badassdev.com/articles/2013/1/9/centos-reporting-lower-cpu-mhz-in-proccpuinfo.html
http://serverfault.com/questions/400774/why-does-cpuinfo-report-that-my-frequency-is-slower