The VMware Compatibility Guide is your friend!

Fairly simple one today folks!

I was trying to do an install of ESXi 5.1 U1 on a Cisco C240 M4 and getting a really pretty purple screen saying: NOT_IMPLEMENTED bora/vmkernal/hardware/apic.c:1048

After a frustrating call to VMware support, I threw my hands up and went to the web to fix it myself (I Googled it of course). 

I got what pointed me the right direction from this link.

https://www.vmug.fr/topic/27801-ajout-et-installation-esxi-51/

Steve_Delassus pointed at a KB article and then said something simple...."Check the compatibility matrix and see if your server is in it". 

http: //www.vmware.co...Category=server 

Well, heck....there is was ....plain as day....

Cisco UCS - C240-M4 Intel Xeon E5-2600-v3 Series ESXi 6.0 5.5 U2 5.1 U3 5.1 U2

I kicked my self a couple of times, then downloaded 5.1 U3 and it installed with no issues....

So what have I learned Boys and Girls? The VMware Compatibility Guide is your friend!