Answer

Go to BIOS setup >>Seting >>Advanced >>Hardware Monitor >> Set CPU Smart Fan Target to "Enabled"，Set "CPU Min.Fan Speed" .

Models

A88XI AC, B75A-G43, K9A2VM-F V2, B75A-G43 GAMING, H97 GAMING 3, K9A2GM V3, P67A-C45 (B3), X99S GAMING 9 AC, Z77A-G45 GAMING, Z97I GAMING AC, A55M-P25, CSM-Q87M-E43, H61M-P22 (G3), H81M-E35 V2, H97 PC Mate, Z68S-G43 (G3), Z87-G45 GAMING, ZH77A-G41, 785GM-E51, 785GTM-E45, 880GMA-E41, H61M-P20 (G3), H61M-P32/W8, H67MS-E43, P67A-C45, Z68A-GD65 (G3), Z77IA-E51, Z87 XPOWER, B75A-G41, B85M-P33 V2, FM2-A75MA-E35, H61M-P31 (G3), H81M-P32, H97 GUARD-PRO, PH67A-C43 (B3), 740GTM-P21, 760GMA-P34 (FX), A55-G45, B75MA-E31, FM2-A85XMA-P33, H67MA-E35 (B3), KA780VM-D, Z87 MPOWER MAX AC, 880GMS-E35 (FX), 880GMS-E41, 990XA-GD55, B85M GAMING, FM2-A75MA-P33, H81M-E33 V2, Z68A-GD80 (B3), Z77A-G45 Thunderbolt, Z87-G41 PC Mate, Z87M GAMING, 880GMA-E55, A58M-E35, Big Bang-Marshal (B3), H61M-E33 (G3), H87-G43, H87-G43 GAMING, H87M-G43, P67A-GD55 (B3), Z97 GUARD-PRO, Z97M GAMING, 970 GAMING, H61M-E23 (B3), H81-P35, Z77A-GD80, Z97-GD65 GAMING, A55M-E33, A88XM GAMING, H81I, H81M-P32L, H97I AC, H97M-E35, K9A2GM V2, P67A-GD65 (B3), X79A-GD65, X79MA-GD45, Z68A-GD55 (B3), Z68MA-ED55 (B3), 740GTM-P25 v1.5, A88X-G43, B85I GAMING, H61I-E35 V2/W8, H61M-E33/W8, H61M-P31/W8, H61M-P33 (B3), H67A-G43 (B3), H87I AC, P67A-GD53 (B3), P67S-C43 (B3), Z77 MPOWER, Z77A-G43 GAMING, 740GTM-P23, 970A-G46, A88X-G45 GAMING Assassin’s Creed Liberation HD, B75MA-P33, FM2-A55-G43, H61M-E22/W8, H61M-G35 (G3), P67S-C43, Z87M-G43, 760GM-P35, 880GM-E41, FM2-A85XMA-E35, H61M-P35 (G3), X79A-GD45, X99S XPOWER AC, Z68A-GD80 (G3), Z77A-G43, Z97 MPOWER MAX AC, Z97-G43, 880GMA-E35 (FX), 880GMS-E35, 970A-G43, 990FXA-GD65, B85M-E33 V2, H67MA-E45, X99S SLI PLUS, Z87 MPOWER MAX, A55M-P33, FM2-A85XA- G65, H67MA-E45 (B3), H67MS-E33, PH61A-P35 (B3), PH67S-C43 (B3), Z87 MPOWER, Z87-GD65 GAMING, Z87I GAMING AC, 760GM-P33, A55-G35, A55-G41 PC Mate, A78M-E45, A88XM-P33, B85M-E43 DASH, FM2-A75MA-P31, H67MS-E33 (B3), H87M-E35, X99S MPOWER, Z97 U3 PLUS, Z97-G43 GAMING, 880GMS-E41 (FX), A75MA-G55, A88XM-E35, B85I, B85M-P32, FM2-A55M-P33, H61M-P35 (B3), H87M-E33, P67A-G45 (B3), X79A-GD65 (8D), Z77A-G45, Z77MA-G45, A75A-G35, B85M-P33, FM2-A55M-E35, FM2-A55M-P31, FM2-A75IA-E53, H61M-E33 (B3), H61M-P21 (B3), H67MS-E23 (B3), H81-P33, Z97 MPOWER, 785GM-E65, FM2-A85XA-G65, H61M-E23 (G3), H61M-P23 (G3), H67MA-E35, H97M ECO, P67A-GD65, X99S GAMING 7, Z77A-GD55, Z77A-GD65 GAMING, Z97 GAMING 7, Z97S SLI Krait Edition, 740GM-P21, A78-G41 PC Mate, B85M-G43, FM2-A55M-E33, H81M-E32, H87M-P32, Z97-G55 SLI, 740GM-P25, 990FXA-GD80, B75A-E33, B75IA-E33, H61M-P23 (B3), Z68A-GD55 (G3), Z68MA-G43 (G3), ZH77A-G43, 740GTM-P25, 890FXA-GD70, A88X-G41 PC Mate, H67MA-ED55, H81M-E34, H81TI, P67A-GD55, Z68A-G43 (B3), 760GM-E51 (FX), 880GMA-E45, B75MA-P45, H61M-E22 (G3), H61M-P20/W8, H81M ECO, H87M-P33, KA780VM, P67A-GD53, Z68A-G45 (G3), Z68MA-G45 (G3), Z97M-G43, 760G-P43 (FX), B75MA-E33, H61I-E35/W8, Z87 MPOWER SP, Z97 PC Mate, 880GMA-E53, 880GM-P51, A58M-E33, H61I-E35 (B3), H61M-P25 (B3), Z68A-G45 (B3), Z97 GAMING 3, Z97 GAMING 5, Z97I AC, 890FXA-GD65, A55M-E35, A75A-G55, Big Bang-XPower II, H61MA-E35 (B3), H81M-E33, H97M-G43, KA780GM2, P67A-C43, P67A-C43 (B3), X79A-GD45 (8D), Z68A-G43 (G3), Z77A-GD65, Z87-G55, 760GA-P43 (FX), 880GMA-E35, B85M-E33, H87-G41 PC Mate, H87I, Z77A-G41, Z87I, Z97-G45 GAMING, 760GM-P21 (FX), A58-G41 PC Mate, H61MU-E35 (B3), H67MS-E43 (B3), Z77IA-E53, Z87-G43 GAMING, Z87I AC, Z97 XPOWER AC, 760GM-P23 (FX), 785GM-P45, A75MA-P35, B85-G41 PC Mate, B85M ECO, FM2-A85XA-G43, H61M-P25 (G3), H67MA-ED55 (B3), H81M-E35, P67A-GD80 (B3), Z97 GAMING 9 AC, Z97S SLI PLUS, 760GTM-P33, 970A-G45, A78M-E35, B85-G43 GAMING, H61M-P22 (B3), H81M-P33, P67A-G43 (B3), PH61-P33 (B3), X79A-GD45 Plus, Z77A-G41 Plus, Z87-G43, 860GM-P43 (FX), 880GM-E43, A88X-G45 GAMING, B85-G43, H77MA-G43, H81M-P33 V2, 760GM-E51, 760GM-P34 (FX), 880GM-E35, A55M-P35, A88XM-E45, B75MA-G43, B85M-E45, Z68A-GD65 (B3), Z68MA-G45 (B3)