This fix may work for many other Proliant servers.
I was able to successfully convince the hardware health monitor on my HP Proliant ML330 G3 that I had installed the proprietary HP CPU fan when I had not. The Proprietary CPU fan is often sold upwards of 120$. I made the system accept any fan. You will need to install the non-hp fan with a Molex to fan converter.
The fix is simple. Looking at the fan connecter with the tab on the bottom the pin numbers are 1, 2, 3, and 4 going left to right. Simply connect pin 1 to pin 2 then use a 27 Ohm 1/4 Watt resister to cconnect pin 2 to pin 3.
That's it. I tested it on more then one machine and tested for a few hours to check for slow system damage over time.
Just remember with this fix you lose any real fan monitor. You can either simply let the thermal monitor be the remaining monitor to save your CPU from melt down or you can add a different fan monitor.