A computing system, comprising: a plurality of Central Processing Units, CPUs; a plurality of Peripheral Component Interconnect Express, PCIe, switches; a plurality of network interface controllers, NICs; and a connection mechanism that enables at least one connection route among the plurality of CPUs, the plurality of PCIe switches, and the plurality of NICs to be adjusted to set a specific PCIe topology of the computing system; wherein the specific PCIe topology includes a full configuration mode, a balance mode, a common mode, and a cascade mode; the connection mechanism comprises multiple mini Serial Attached SCSI, SAS, connectors and at least one physical PCIe cable; the connection mechanism further comprises a golden finger repeater board installed on one of the plurality of NICs; in the full configuration mode, a first CPU is connected to a first switch and to a second switch, and a second CPU is connected to a third switch and to a fourth switch supporting all downstream ports; in the balance mode, the first CPU is connected to the first switch while the connection to the second switch is interrupted, and the second CPU is connected to the third switch while the connection to the fourth switch is interrupted; in the common mode, the first CPU is connected to the first switch and to the third switch while the interconnections of the second CPU to the switches are interrupted; and in the cascade mode, the first CPU is connected to the first switch, wherein the first switch is connected via the golden finger repeater board to the upstream port of the third switch, while the interconnections of the second CPU to the switches are interrupted. a plurality of Central Processing Units, CPUs; a plurality of Peripheral Component Interconnect Express, PCIe, switches; a plurality of network interface controllers, NICs; and a connection mechanism that enables at least one connection route among the plurality of CPUs, the plurality of PCIe switches, and the plurality of NICs to be adjusted to set a specific PCIe topology of the computing system; wherein the specific PCIe topology includes a full configuration mode, a balance mode, a common mode, and a cascade mode; the connection mechanism comprises multiple mini Serial Attached SCSI, SAS, connectors and at least one physical PCIe cable; the connection mechanism further comprises a golden finger repeater board installed on one of the plurality of NICs; in the full configuration mode, a first CPU is connected to a first switch and to a second switch, and a second CPU is connected to a third switch and to a fourth switch supporting all downstream ports; in the balance mode, the first CPU is connected to the first switch while the connection to the second switch is interrupted, and the second CPU is connected to the third switch while the connection to the fourth switch is interrupted; in the common mode, the first CPU is connected to the first switch and to the third switch while the interconnections of the second CPU to the switches are interrupted; and in the cascade mode, the first CPU is connected to the first switch, wherein the first switch is connected via the golden finger repeater board to the upstream port of the third switch, while the interconnections of the second CPU to the switches are interrupted.