Not booting after changing nic to DELL INTEL PRO 1000ET 4x1GB PCI-ex4

Hi! I have problem on my futuro s920, after changing card from Dell Intel Pro/1000ET 2x1Gb to DELL INTEL PRO 1000ET 4x1GB PCI-ex4. The system is not booting, display show cursor and nothing more...
Tried to remove /etc/config/network to see if maybe it will boot, but it didn't. After changing card once again to old card, it works normally. What could be the issue?

Is it the dual core version ?

yes, dual core

then the quad port card probably won't work, read the threads.