i do have nearly the same situation.
I am on 6.0 U3. Device can be added to vm Set all parameters.
But i cannot see any device in windows.
This is my config:
pciPassthru.use64bitMMIO="TRUE"
pciPassthru.64bitMMIOSizeGB = "32"
pciPassthru0.id = "00000:010:00.0"
pciPassthru0.deviceId = "0x15f8"
pciPassthru0.vendorId = "0x10de"
pciPassthru0.systemId = "576cdd74-0d85-0676-65b7-0025b50002ab"
pciPassthru0.present = "TRUE"
pciPassthru0.pciSlotNumber = "192"
Is it correct, that i do not have to install any driver?