I've used alpharacks and considering the performance of their VPSs, I'm sure they're heavily overselling their services. Same is the case with i83 and their cheap NATed VPSs.
On the other hand, I've been using Frantech/buyVM and the dirt cheap $2.50 VPS from vultr, and never faced any problems with them.
On the other hand, I've been using Frantech/buyVM and the dirt cheap $2.50 VPS from vultr, and never faced any problems with them.