Hi Kerim,
The maximum number of physical NICs supported by the Nexus 1000v per host is 32.
SV1(4a) Configuration Limits
There is no distinction between 1g vs 10g from the N1Kv perspective. However if you review the VMware configuration maximums guide, they outline further restrictions from the ESX/i perspective
vSphere 4.1 Config Maximums
vSphere 5.0 Config Maximums
Hope that helps
Thanks,
Michael