What is exactly ECU ?

There are many CPU unit that Providers use : ECU , vCloud, Ghz,...
So, Can we convert these Unit to Ghz.
http://www.cloudorado.com/ I can not understand how this site convert these unit.
with joyentcloud.com
1 vCPU = ~ 5.8 ECU
How can they determin
Can some expert explain me clearly about this ?
Thank you very much
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David Johnson, CD, MVPOwnerCommented:
They cover it well in their faq http://www.cloudorado.com/FAQ.jsp

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