Various embodiments of the present invention provide systems and methods for using providing memory access across multiple virtual machines. For example, various embodiments of the present invention provide thinly provisioned computing systems. Such thinly provisioned computing systems include a network switch, at least two or more processors each communicably coupled to the network switch, and a memory appliance communicably coupled to the at least two or more processors via the network switch. The memory appliance includes a bank of memory of a memory size, and the memory size is less than the aggregate memory quota. In some instances of the aforementioned embodiments, the memory appliance further includes a memory controller that is operable to receive requests to allocate and de-allocate portions of the bank of memory.