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Hi all, After several attempts and tests I've got flawlessly working Dell Precision 670 workstation under Snow Leopard 10.6.8. I used Nawcomm ModCD 0.3.2, Nawcomm's legacy kernel 10.6.8, ##### SL 3.10.1 with my own generated DSDT (without patches). Everything works fine except NIC. I could not bring to life onboard NIC so I started to test various PCI NIC cards. After some research I decided to buy refurbished PCI-X Intel PRO/1000MT DUAL (Intel 82546EB chip). I assumed the card will work because I found it was sold by Mac accesory producers: Sonnet (Presto Dual Gigabit NIC) and SmallTree. Therefore I think I'm very close to get it to work. Remark 1: Precision 670 mobo has following PCI ports: 1x PCIe 16X (graphics), 1x PCIe 8x (works as 4x) 1x PCI (32 bit) 3x PCI-X (64 bit) Short PCI slot is reserved for my Audigy soundcard (btw working great with kx driver) and PCIe is reserved for the Revodrive 3 which I'm going to buy in near future. So, available slots for NIC are PCI-X slots. Remark 2: I also buy refurbished Realtek 8169 PCI-X card, which works OOB in Snow, but - and this is somewhat funny - I could not find working Windows 7 driver and my 670 has to be dual OS'ed. I also noticed poor network performance using this card. OK, let's back to Intel NIC. Card is properly recognised by OSX: Now: I've modified AppleIntel8254XEthernet (in IONetworkingFamily) setting valid device ID: 0x10108086 (default was 0x10008086). Plugin ethernet cable causes kernel panic, when configuration in Network system preferences either is set to DHCP or manually: And, of course I found the SmallTree drivers which someone in this forum reported working, but I could not manage it to work, trying 3.2.22 and newest 3.4.24 version. SmallTree kext is installed but it is not loaded on startup. So, dear community, I appreciate any help or hints to work this s..t out ;]