I have recently bought a second hand HP Elitebook 8540W with a Nvidia Quadro FX1800M installed.
I am having a problem where the GPU clock will get stuck at it's power saving clock of 405 MHz whereas it should be running at 560 MHz, the difference between these clocks results in a 217% performance change so I assume that other aspects of the GPU are being throttled down too. I cannot override this by changing the clock in Nvidia control panel or MSI afterburner. The only way I have found to temporary resolve the problem is to restart my laptop.
I have confirmed that the clock does not return to normal when 3D applications are open. I have the latest driver installed and I have tried 2 different previous ones (can't remember which). Power management in the Nvidia control panel is set to "Prefer maximum performance". PCI link state power management in Windows power settings is set to off.
The low power mode has turned on and stayed that way after a driver crash but has also happened several times for no apparent reason, my only theory is that when the GPU reaches a certain temperature it will go in to the low power mode to prevent it from catching fire. Obviously it is a good thing that it prevents component damage and system crashes but it is very annoying that it does not return to it's performance mode once the temperature drops.
So does anyone have any idea what's going on?