Is the Intel Z68 chipset supported by ESXi 5.0?
I looked at the HLC at http://www.vm-help.com//esx40i/esx40_whitebox_HCL.php#MB
I only saw 1 gigabyte board with a Z68, that wasn't fully 'green' on the OK button. But that HLC is only for ESXi 4, though (oddly enough).