Hello Knat,
I have the same problems with network adapters. They work fine with ESXi 4.0, but on ESX 4.0 I had problems.
NICs are Intel, but desktop versions. For ESX 4.0, installation process asks for "ESX drivers". I can not find Intel driver from Intel Support website.
I changed NICs, because I did not find drivers on VMware site.
Now I use ESX 4.0, but with server NICs.
I suppose that you must find driver for P400, because I use P410 and it works without additional driver.
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VSP4, VTSP4, VCP4
ITIL v.3 Foundation