@lexluthermiester - You have the low power C1E state enabled in your last two pictures. When this C State is enabled, the CPU multiplier and CPU voltage are rapidly cycled up and down to decrease power consumption. If the CPU has something to do, the multi and voltage go high; CPU is idle with nothing to do, CPU multi and voltage go low. This is happening continuously hundreds of times per second and each thread can enter various C States individually. ThrottleStop uses high performance timers within the CPU and is able to calculate a very accurate average multiplier while this is happening. The data looks very strange but it is accurate.
Your first picture shows a nice even 25.00 multiplier. I had a look at the Intel docs and it shows that the X5675 also has access to a 26 multiplier. CPU-Z confirms that your CPU supports a 26 multiplier. This higher multiplier is only available if you have either C3 or C6 enabled and it is only used when 1 or 2 cores are active and the other cores are resting in C3 or C6. Click on the C6 button and have a look in the ThrottleStop C State window to see if your CPU is spending any time in either of those two C states. I am pretty sure you are going to see 0.0 for all of the entries which would confirm that C States are disabled in the bios, either accidentally or on purpose. If you want to do some testing, re-boot, enable at least C3 in the bios and then once Windows has settled down, try running a 1 Thread TS Bench test. While the CPU is loaded and this test is running, you should be seeing a multiplier higher than 25.00. Look in the C State window while testing and you should see various cores going into C3 and or C6.
You are welcome and thanks for doing some testing and posting some screenshots. Now that I have access to some 6 core CPUs, I am thinking about making a special stretched version of TS so I can see what all 12 threads are doing at the same time without having to scroll the data. If I ever get around to doing that, I will post a download link in this thread.
Your CPU supports hyper threading which is 2 threads per core. Your screenshot also shows this. The first thread is the primary thread and it is spending 4.8% of its time in the C0 state with average multiplier of 24.47. The second thread is spending 0.0% of its time in the C0 state so its average multiplier is only 16.78. The next two multipliers, 24.55 and 14.80 also show the primary thread doing the work at almost full speed and the hyper thread is barely needed so it is only spending 0.5% in the C0 state at a lower multiplier and voltage. Good little utility for the OCD types.