Abhik

The WordPress Server Load Plugin adds a Server Load Averages and Server Uptime widget into your Admin Dashboard.
This Plugin does not add any options page in your WordPress Admin Dashboard. After activating the Plugin, go to your Admin Dashboard Home and see the new widget.
Plugin developed by <a href="http://www.itsabhik.com" rel="nofollow ugc">Abhik</a>.

WordPress Server Load

The WordPress Server Load Plugin adds a Server Load Averages and Server Uptime widget into your Admin Dashboard

chriserk

This Plugin adds a Server Load Averages and Server Uptime widget into your 
Admin Dashboard and admin bar that automatically refreshes.
This Plugin adds an options page in your WordPress Admin Dashboard. After activating 
the Plugin, go to your Admin Dashboard Home and see the new widget and the load average in the admin bar. 
You can configure the admin bar load average options from the settings page under: 
Settings > [TNM] Server Status
Plugin developed by <a href="http://www.chriserk.com/" rel="nofollow ugc">Christopher Erk</a>.

[TNM] Server Status and Load Average

The WordPress Server Load Plugin adds a Server Load Averages and Server Uptime widget into your Admin Dashboard and a load average widget to the admin …

WordPress Server Load vs [TNM] Server Status and Load Average