I have an Asus Nvidia Geforce GTX 550TI In my system. For some reason, a short time after booting up my PC it's clock rates will drop to their minimums
regardless of the load on the card.
For example, I can run a game a few minutes after booting up and it runs at 60fps no problem for say about 10 minutes, with the clock speeds at their normal values. But then suddenly the clocks drop down to the minimum and even with 100% usage on the GPU they stay there and my framerate drops to ~2fps.
I have MSI afterburner installed which as far as I know is the only non-system program that has control of the GPU clock speeds. But I only use that for fan control and on-screen display. The clocks and voltage are left at their default values
Once the clock speeds fall to their minimum they stay there until i restart the PC and then the whole process starts again and it works fine for a little while before dropping back down again after a seemingly random amount of time.
Any ideas or help is appreciated.
Edit: It does appear to be Afterburner causing it, but strangely only when started with windows. If I uncheck the box to start afterburner with windows and restart then the card runs fine without afterburner running (ignoring the temperature) and then if I open afterburner and apply the fan control it seems to continue to run without any of the previous problems.