[ovirt-users] CPU reporting Intel Xeon E312xx (Sandy Bridge)

I'm new to ovirt and I'm wondering if this affects performance, or if it is just a layer of abstraction given to the VM? I was able to get correct CPU reporting by ticking "pass-through host CPU" but I'm not sure if this is a necessary thing to do. I assume it's just an abstraction thing for live migration or something of the sort, could someone shed some light? Thanks, Luke