DQ67SW is known to run ESXi including VT-d.
Of course you need to swap also the processor for a knew one like core i5 2500 (no K) or similar running vt-d.
With ESXi release 4 the LAN controler 82579LM was not known by ESXi, asking for an expansion PCI adapter, maybe solved with ESXi5.
The Intel page for virtualization:
DQ67SW available here, not so far from you (among others):
Thanks for advice and reply,
but I'm exclusively looking for a motherboard with the Intel Q45 chipset and specifications like DQ45CB, but it has support for DDR3 instead DDR2 RAM.