Originally Posted by wrtIAp
So what does the APU PCIE VDDP do actually? I've never changed it before. If it's related to the iGPU, does that mean I can lower the NB Voltage after upping the VDDP? My VRM's are actually quite cool, now that I've ripped off some of the stock cooler blades for the VRMs + the stock fan
, and they've run crazy hot before without causing the crashes I'm facing after reboots.
Btw, I am getting 1.256/1.272V for CPU when it's set to 1.30625V BIOS, so you're quite right about the 0.05V Vdroop.
Thanks everyone for the help so far, I didn't want to put more burden on this thread with my problems at first, but not being able to turn my computer on and be stable in 1 go is really starting to drive me crazy
No worries mate, it's in the name of progress!
About VRMs I did the same thing, put stock fan from 7850k heatsink under it to help with cooling, since rear-mounted radiator with push-pull fans obscure VRMs heatsink. That fan bitten me a moment ago again...nasty bugger!
APU PCIE VDDA (that's the name on ASRock at least) represents voltage that feeds the integrated pcie controller on apu. Now you might think it is of no use when you are not using dGPU or other cards on pcie lanes...but as far as I know, iGPU sits on some kind of internal pcie lane itself. I don't work for amd, so I might be as well wrong, but all the info I gathered points that way - if there is someone more educated in the matter, I would welcome additional info myself.. When there is some kind of ram or igpu instability (and lets face it, most instabilities on igpu here are caused by dram anyway, because even at idle 350mhz igpu clock it shares full dram clock speed/timings at all times), bumping apu pcie vdda should help. It allowed me to go back to stock 1.65V on dram. Whether it affects NB and IMC in some way, I don't know. What you could try is loading stock bios profile again, or lets say something conservative like 4ghz cpu, stock igpu, ram clock/timing you want to be using and then rising VDDA up slowly, by 0.025V increments or faster in 0.05V bumps. I'm still at 1.206V myself.
About drivers on fresh install I went to amd.com > drivers+support> drivers+download centre> filled in 7850k and chose beta (the lower driver - should be 14th jan iirc) and istalled everything except for Catalyst. After reboot, amd.com again > drivers+support > latest amd apu drivers for win7 64bit 14.3 beta, installed full package with Catalyst too now, except for that gaming software it comes with. If you are going to reinstall catalyst, its always good to first use clean uninstall utility from amd...I guess they know better why they are suggesting it that way.