To add the Intel 82579 chipset, create a customized ESXi 5 ISO. This is very simple because some people have already done the hard work.
Here are the steps:
1. Download ESXi-Customizer (create by Andreas Peetz) found here.
2. Download the driver (created by Chilly) found here.
3. Start the ESXi-Customizer and follow the 3 steps:
And your ready to install the customized VMware ESXi 5 ISO. The ISO supports the Intel 82579V and 82579LM NIC(s) found on many whitebox motherboards.