Ok just finished.
I have a SC420 built on MB controller (On MB), 146 Gi SATA Drive, and 1 Gig of Ram with Celron Processor.
ALL work just fine with bootable install of esxi on ISO (not thumb drive)
You have to follow this thread and disable the cpucheck, otherwise it works fine. Look and make sure you go into vi client and disable the CPU check there as well. DELL SC420 420 Server.
My Built in NIC worked as well.
Overall, very easy. I would add that I already have a vm running of XP on the system now, do this makes for a good basic test lab.
THANK YOU everyone who contributed. Now if I can find a low cost CPU upgrade and a bit more ram I am set. Might even see if I can get thumb drive to work someday..Ill post if I do.