I happen to have the EXACT same problem as nickfall with my Dell XPS 15. Poor SSD performance and CPU capped at 800 MHz.
My configuration is as follows: i7 6700HQ, 8GB RAM, NVMe THNSN5256GPU7 SSD. What I've tried:
- install both old as newest BIOS driver
- clean Windows 10 install --> problem persists
- boot in safe mode --> problem persists
- turning off windows write cache flushing --> problem persists
Did anyone find a proper solution yet?
Ok, I had the same problem, but I think it's now fixed. I followed these recommendations:
Disconnected the battery for 15 seconds and everything works like a charm. Strange though.
@Nyanes: I see - this is one thing I had not tried. Maybe one day, when I feel like opening that laptop again. I have ThrottleStop running in the background with BD_PROCHOT disabled, which does the trick. Thanks for taking the time to let others on the thread know 🙂
I've found this driver fixes the issue for me for now: www.dell.com/.../driversdetails
(Previously had Windows write-cache buffer flushing turned off to fix it. Now I have the checkbox unticked and performance is still good.)