If I can make due with a 500 watt PSU and put in a 2000 watt PSU into a server. Will that make the computer use more amps and thus might necessitiate me paying extra at a colocation center or will the computer draw the same amps either way?
Here is something to make things clearer
http://serverfault.com/questions/62339/how-can-i-calculate-a-servers-amperage
The guy in the first answer says
"The only way to be sure about your system's utilization is to measure your server's utilization under your expected load. A PSU that can draw 500 watts, if you've got 220v power, can draw up to 2 amps, but it may draw only .5 amps under typical loads for your workloads."
Here is something to make things clearer
http://serverfault.com/questions/62339/how-can-i-calculate-a-servers-amperage
The guy in the first answer says
"The only way to be sure about your system's utilization is to measure your server's utilization under your expected load. A PSU that can draw 500 watts, if you've got 220v power, can draw up to 2 amps, but it may draw only .5 amps under typical loads for your workloads."