I'll run 2.56 just in case, but HWI says the same, and Valley just shows what the settings are 'supposed to be'. So if it was running normally but started to downclock due to heat or whatever, that number never changes.
As additional info, I ran 3dMark NightRaid and looked at those charts, its...
More or less the tile...The card sits at its base clock and 99% usage but never changes.
I've tried 3 different driver versions (Dells latest, Nvidia DCH(?) latest, Nvidia 'normal' latest) - no difference
Tired changing power options in Nvidia Control Panel - no difference
Card isn't close to...
I can guess on some 'basic' reasons:
Power Outage / System Crash - Enter incomplete and or corrupt values in memory addresses such that the card can't figure out what to do anymore.
Using a Different Card / Maker BIOS - Different order of memory addresses and or different sizes of memory...