Quote Originally Posted by zalbard View Post
Any idea what's up with the black screen when overclocking? What can it be caused by?
System runs just fine, then screen just turns off, fans keep spinning, no BSOD, no reboot, nothing.
Radeon 5870, stock settings.
Can it be caused by 1.35V CPU PLL perhaps? I'm pushing for 4.2GHz atm, 12x200 passed just fine with these settings, but trying 21x200 with increased vCore and I'm getting these black screens.

Oh, and "without VDroop" means that volts won't drop under load, right? Sort of improved LLC? Or should I enable VDroop to get this effect and I got this wrong?
From what I gathered "without VDroop" should work best for overclocking, am I right?
I have that problem, but for me it is a faulty video card. There is a problem with the power connectors so if they move just slightly the card will simply turn off. I can reproduce it at will by tapping the power connectors on the card. Maybe it is a problem with the card for you as well?