Configuration in question:
- Model - Dell 1558
- CPU - Core i7 740 @ 1.73Ghz - 2.93GHz
- RAM - 6GB DDR3 1333Mhz
- OS - Windows 8 Pro MSDN
Now this problem has started since yesterday.
My computer blanked out suddenly (like absolutely suddenly). And when I rebooted, the operation was sluggish. I figured out that the CPU was stuck at 0.90Ghz (which is the lower limit at which my i7 'rests' generally. Further, the CPU consumption at this 'low' frequecy is also capped at 53% - making my device a Quad-Core running at 450MHz (:-O). The device manager isn't showing any erroneous drivers and neither was any update installed in the vicinity of a few days.
Hence I did System Restore to a fortnight back. It took a lot of time due to the low frequency it was locked at - but once rebooted, the CPU started functioning normally. However, only a few minutes into the operation it again went back to 0.90GHz - and just stayed there. This is happening at every reboot now - a few minutes of sanity then everything is just a drag.
I don't think its an issue with the CPU heating up because the temperatures are staying within the same limits as any earlier time (HW Monitor). But, now, when I'm shutting down, it doesn't reboot immediately - as if it is overheated (which it is not - I even set the fan throttle to full 100%).
Any ideas on what the problem seems to be with my CPU and how to treat it?