Most CMPs use on-chip networks to connect cores and tend to integrate more simple cores on a single die. Low-radix networks, such as 2D-MESH, are widely used in tiled CMPs since they can be mapped to on-chip networks efficiently. However, low-radix networks introduce high network latency caused by long diameter. In this paper, the authors propose the use of group-caching design in NoC based multicore cache coherent systems. In their design, on-chip L2 banks are organized to form multiple groups.