And Intel NIC's in servers, which are doing great lately because they support extensions that allow virtual machine isolation levels in hardware. (I know a big cloud provider that uses this, but I'm not sure if they told me under NDA)
I'm going to bet that practically 95% of big cloud providers use SR-IOV, at least in some 1gig + offerings if not pervasively.
Although, Amazon has recently switched over to a new network card called ENA, which is made by a company they purchased. All recently released instance types use it instead of the intel SR-IOV nics