I have recently bought a Quad Core 9400 processor 2.6 ghz over a core 2 duo processor which was pretty old. I installed it, then updated all the drivers and did the windows update to the latest. In the Bios the processor showed all 4 cores running but when in windows when i checked in task manager's performance, it was showing only 2 cores. I re-checked the same in device manager under processor and it was showing 2 unkown device entries. So, i was wondering whether this is a processor fault or some software issues which is not letting all the 4 cores to run, any ideas?
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