A system-level exploration of power delivery architectures for near-threshold manycores considering performance constraints

Continuous technology scaling and increased demand for computational power have introduced a paradigm shift in manycore design requirements. On the other hand, tight power budgets and limitations of voltage scaling are throttling the ability to optimally exploit the potential of these systems, leading researchers to adopt aggressive voltage scaling techniques such as Near-Threshold Computing (NTC). In this paper we evaluate and compare the efficiency of different power delivery schemes for NT manycore architectures under process variation while meeting performance constraints. For platforms operating in a specific voltage range, simple and cost effective Power Delivery (PD) architectures can deliver average power savings ranging from 24% up to 50%, when taking into account the workload characteristics of the target applications at design time1.