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AM3 PLL volts ? And +ve vdroop? DRAM voltage all over the place.

post #1 of 3
Thread Starter 
Running a PH2 x4 955 BE as in my sig. Problem thus far: stuck at 3.8GHz..CPU_NB is at 2.73GHz . Anything over results in stupid BSODs ..

I've read that changing the PLL can help in some core overclocks ( definitely helped on my GFX --6950TF3 unlocked) kinda hoping it'd help out on my CPU too..

My BIOS ( MSI 990fxa -g65) gives me a wide range from about 1.5 to 3+ Volts on the CPU PLL.. This used to be called VDDA on my prior Asus 785GM-td-v evo.. and I never bothered with it ..

Btw, the range on this PLL voltage takes a biug jump from 2.5V to 2.9V ... no stop gaps in b/w !!! So should I be gunning for higher V_PLL or stick to 2.5 ?

2nd problem : My cpu VCore jumps up a bit on loading it ... is it the APS feature on MSI boards? Cause my CPU is definitely running hotter than before.

Idle : 1.38VCore --CnQ off
load : 1.41VCore --CnQ off

I thought Vdroop was good. I had turned off LLC on my old Asus mobo and am surprised to see no such option on a better MSI board and this spiking.

3rd problem : My DRAM voltage is all over the place. My BIOS's green power page shows about .5V lower than whatever I set my DRAM voltage to.. If I set it to 1.677 ( like as of now) then it shows about 1.62VDRAM fluctuating +/- 0.01V

Is this a sensor glitch? Should I bother to compensate for the -0.05V drop ( don't know if it really exists) or not ?

************

So net : need help troubleshooting :
1. My PLL problem ? Can I take the 2.5 -> 2.9V jump without risking any damage? Would it really help on air?
2. Help with the VCore jump on load.
3. DRAM shows lower than what is set in the BIOS.. so should I compensate by throwing moar volts?
post #2 of 3
Vdroop is normal and expected.

You will need around 1.5V to reach 4 Ghz, so try that, atleast thats what it used to take a few months ago on my 965.

As for the software readout of the memory and all other voltages they can be off a bit and you can only check it for certain with a multimeter if you have read points on your board, which I doubt very much. So dont bother too much with them.
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E IV
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3570K ASRock Z77 OC Formula Nvidia Zotac GTX 770 Gskill Trident 2400 Mhz 
Hard DriveHard DriveHard DriveOS
Samsung 840  OCZ Vertex 2 Seagate 7200 Windows 8 
MonitorKeyboardPowerCase
22" Benq Logitech Antec HCP 850W Caselabs SM8 
MouseMouse PadAudioAudio
Logitech G400 Razer Asus Xonar DGX Microlabs C Series 
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post #3 of 3
Thread Starter 
Well , if my BIOS is showing a reading of 0.05V LESS than what I set, should I go and overvolt the RAM ?

And, 3.8GHz @ 1.38VCore is good, esp on an old 955 .. My mobo is OVERVOLTING on load ... just the opposite of vdroop. There's no LLC as was on my prior Asus. So why is this happening !!

CPU Vcore :

idle : 1.38-1.39( max
load: 1.41-1.43( varies

You see what I'm dealing with here ! For me to get 4GHz, even for windows to start , I need 1.43Vcore ... and the second I load it up w/ P95, It spikes to 1.47Vcore( lovely MSI +vdroop mad.gif ) , the heat and the backward leakage, I really don't think my chip's cut out for it .
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