Strange problems with CPU

[Godcer]

I bought Assassin's Creed 1 a couple days ago and have now downloaded it. What is weird that I sometimes get huge lag, which should not be a problem for me because of my powerfull computer, it has normally been lagging for a few seconds and then go back to normal. It was different today, I got all the way down to below 5fps(checked with fraps) and noticed on task manager that my CPU speed was 5GHz while this was happening. I know I have overclocked the CPU to 4.3GHz but not up til 5GHz. I figured since the CPU is working so fast it must be hot, but when I checked with Real Temp the temp was fine. I then noticed something strange, the CPU speed monitored by Real Temp and the Windows Task Manager was different, Task Manager showed 5GHz but Real Temp showed only 4.3GHz. I have no idea of what is happening so I would like to find out.

On the task manager it also says it is running 87 Processes, 1280 Threads, 31300 Handles.

 

I have an Intel Core i7-3820 @ 4.3GHz on a Gigabyte GA-X79-UD5 motherboard, 16GB RAM and a GTX Titan. I am running Windows 8 Pro 64-bit.

[Oshino Shinobu]

When it happens, what is the load on the CPU?

[Tech_Dreamer]

Check which application is taking up too much system memory, on a long shot: Hard drive stability issue maybe?

[Godcer]

When it happened while I was playing it must have been around 50-75% load.

[Godcer]

I don't know how many processes, threads and handles are normally running but this seems like very many to me.

[LawrenceBarnes2013]

Some thing's wrong mate, although i can't be much of help, one thing,Win8 is a bitch, i had similar problems with it, so i removed it, sold my key and went back to Win7

[Godcer]

Please don't die allready thread

[Guest Generallee]

Poorly optimized game  ?

[Godcer]

I have stress tested my CPU for a bit now, the Windows Task Manager still says that it is running at 5.08GHz when the CPU load is 98%-100% but everything else, Real Temp and the stress test utility says that the clock speed is at 4.3GHz at 98%-100% load which it should. It is very weird.
As of writing this message I can read on the task manager that 72 processess are running, 890 threads going and 24600 handles going on.

[Trik'Stari]

I'd suggest contacting either Intel (maybe?) or Microsoft directly. Or there's the ever fun walk of shame into best buy with a tower for geek squad to check out.