When I installed my new motherboard for a dedicated ESXi machine, I found out that the Intel B75 SATA3 and ASM1061 SATA 3Controller is not supported by Vmware ESXi 5.0.
To fix that, simply upgrade to Vmware ESXi 5.1. There are several methods, upgrade from the installer cd or by command line (CLI).
Connect to the host by SSH with putty
Before you get started, you will need to make sure that your ESXi host has the httpClient firewall rule enabled, else you will not be able to connect to VMware’s online depot. To enable this, run the following ESXCLI command:
esxcli network firewall ruleset set -e true -r httpClient
Also make sure that your ESXi host can reach the following URL (you can specify a proxy if needed):
https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml
To view the available ESXi Image Profiles, run the following ESXCLI command (use the –proxy if you need to specify a proxy to reach VMware’s online depot):
esxcli software sources profile list -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml

This patch is the latest… ESXi-5.1.0-20130304001-standard
Let’s go ahead and upgrade our ESXi 5.0 Update 1 host to latest ESXi 5.1. To install the new Image Profile, run the following command:
esxcli software profile install -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml -p ESXi-5.1.0-20130304001-standard
This can take a few minutes to complete depending on how fast you can pull down the Image Profile. Once it is done, you will see all the new VIBs that have been updated and you will be asked to reboot for the changes to go into effect and then you will be running ESXi 5.1!
After the reboot the Intel B75 SATA3 and ASM1061 SATA 3Controller are detected!

Pretty cool IMO!