CPU Quad core uses only one core Tags: CPUs Quad Core Last response: June 26, 2010 8:56 PM in CPUs Share Sjabba June 26, 2010 8:32:37 PM Hey, i have a Intel Quad Core Q9450 and in the POST it detects all 4 cores but when enter windows, it has a lower speed (2,44 gHz) and CPU-z only detects 1 core active, so i though i might be able to change this in the BIOS i cleared the CMOS and when in the CPU control tab of the bios and activated the other cores and set the speed correctly and now my windows doesnt even start it doesnt do anything as soon as windows is seppose to start up it freezes competely, even after 3 hours. i have no clue what this might be. i run with: CPU: Intel Quad Core Q9450 Motherboard: Nvidea 780i SLI FTW EVGA's A1 edition RAM: 2gig Patroid Viper G-card: Nvidea 9800gtx Sound card: Onboard PSU: 1000w Coolermaster PSU More about : cpu quad core core Raidur a b à CPUs June 26, 2010 8:39:40 PM Do you have the latest bios for your mobo? Sjabba June 26, 2010 8:45:28 PM i have the 780i SLI FTW A1 Edition and there are no BIOS updates for this version. so i still have the bios version that came with the motherboard Related resources Core 2 quad q9300 showing only ONE CORE !!! :(( plz HELP!!! - Forum Quad-Core CPU Only Shows As 1 Core ? - Forum Have quad core only one processor shows in sys info but four in device mngr.??? - Forum My quad core only show 3 cpu - Forum Quad core only using 1 core - Forum Can't find your answer ? Ask ! Get the answer 13thmonkey a b à CPUs June 26, 2010 8:51:42 PM did you swap cpu's after installing windows? or was windows installed with the q9450 in place Sjabba June 26, 2010 8:56:43 PM with the Q9450 in place and i read somewhere that you had to reinstall windows to let it work with multicores but it wont boot from the CD either i tried Win XP and Win 7 Can't find your answer ? Ask ! Publish Related resources: ForumIntel 3Ghz Quad Core CPU only for Apple? ForumQuad Core - Uses ? ForumQuad Core or Dual core for my uses ? ForumUpgrading CPu to Core 2 Quad q6600 or 9500 ForumCpu z displayed two cores but now shows only one core ForumDead space 2 using only one core ? Forumneed a used core 2 quad cpu on the cheapest ForumCheapest intel quad core cpu ForumIs the only advantage of a quad core over a dual core multitasking? ForumQuad core shows only 2 cores in task manager in windows xp ForumChanging Intel Core 2 Duo E8400 to Intel Core Quad ..But which one ? Forum6300 fx vishera black edition ForumCpu Upgrade? ForumIntel quad q8300 processor vs dual core e7500 ForumIntel core i5-750 processor More resources Read discussions in other CPUs categories AMD Intel Intel i5 Intel i7 Phenom Cooling Performance !