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Only half the CPUs available?

CPUs Forum - www.tomshardware.com
Hi, i have got 2 processors, both showing up in bios settings, both as quad (took me a long time to get to the stage i am at)

So my PC is acknowledging the processors are there, in some ways but not in others? The processors i have are both x5355, the motherboard is my171 for the dell precision 690, model num #0f9394

I have had 2x dual core hyperthreaded 3.0ghz which shown 8 cpus in task manager / advanced boot settings (e5050)

See pics for details

Shows up 8 cores (2x quad cores) in computer management, yet in CPU-Z will not let me select another processor? (I have gone through the BIOS settings and there is not an option to edit the use of another processor on / off) And again, in task manager only shows up 4, yet i've had 8 cores showing up before)

Thanks in advance guys, hopefully i can get this sorted!


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