Qnap 300W Single Power Supply Unit for 2U 8-Bay NAS without Bracket SP-8BAY2U-S-PSU Power: 300W (Max) Applied Models: TS-809U-RP Applied Models: TS-859U-RP Applied Models: TS-859U-RP+ Applied Models: TS-879U-RP Applied Models: TS-EC879U-RP, VS-8024U-RP Applied Models: VS-8032U-RP Applied Models: VS-8040U-RP