It looks like a Windows problem, apparently it is a well known issue and it appears to be related with the dirty installation of the update (This is one of the reasons why the OS is recommended to install it as new). One of the plausible solution is this:
Control Panel → Hardware & Sound → Power Options → Balanced Settings (Should be selected) → Change Plan Settings → Advanced Power Settings → Expand the processor management tab and look at your max processor state. (Apparently the Windows power options are messed up)
I'll live you the thread so you can test one of the solutions posted on there.
Thank you for the response. I have checked the settings, it is set to 100%.
As i have explained on my thread, i be able to get back the high frame rate by installing MSI Afterburner and manually set the clock speed of my GPU.
The Crimson driver did not do its job to make my card work properly, it down clock my GPU core and memory to minimum which resulted to lower frame rate. My question now is how to fix my Crimson driver so i dont need to rely on MSI Afterburner.
You are welcome, I understand you want a permanent solution on which is does not include the MSI Afterburner, but Did your tried the old drivers (16.3.2) after the Win10 update ?, if it still persists, my conclusion is that your OS after the update got a little bit messed up (probably on the registries). I'll do some research to see what else I can find, but I will recommend to clean install the same Win10 version that you downloaded if you wanted to try again, since your license is now vinculated to your hotmail/outlook account on that particular hardware, you shouldn't have any problem. This is before returning 8.1 and if you have time.
Thanks man, i think re-installing windows 10 will be my last resort. Problem is cant find my windows 8 CD. I am not sure if i clean install Windows 10, it might ask me for CD key.
From 8.1 to Windows 10 upgrade, CD key is not required.