A printed circuit board may include a memory controller, a plurality of synchronous data memory devices, each synchronous memory device including at least one data pin and at least one address/command pin, an ECC memory device including at least one ECC data pin and at least one ECC address/command pin, and at least one surface. The plurality of synchronous data memory devices may be arranged around a central location on the at least one surface and each synchronous data memory device may be oriented such that the at least one data pin is further from the memory controller than the at least one address/command pin.