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1090T Vcore at 1.59v SAFE?? - Page 2

post #11 of 32
Been looking at this anomaly since I picked up this board and chip.

Tried other BIOS's. They are actually cause more problems and don't fix the voltage problem. The latest BIOS has a CPU-NB frequency multiplier cap of x12, totally worthless.

I think it's something to do with the Turbo core feature trying to bump voltage (even when it's disabled), but I haven't totally figured it out yet. Regardless, it's not impeding my overclock. I can do 4.0GHZ stable @1.4875v (set in BIOS) even though board raises volts to 1.525v under a prime95 torture test. CPU-NB is rock solid 3.0GHZ @1.35v.

You can see the voltage fluctuation in CPU-Z and HW monitor, and if you look at CPU data in the BIOS it shows core voltage (the manual setting) and the CPU VID (what it raises to under heavy load), although you won't see this difference in Core Temp or AMD Overdive.

Maybe this has something to do with the AM3+ ~

Edited by damric - 5/19/11 at 7:33pm
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post #12 of 32
LOL man, I use 1.59V to do suicide runs on SuperPi at 4.4+ GHz!!
   
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post #13 of 32
Thread Starter 
Quote:
Originally Posted by damric View Post
Been looking at this anomaly since I picked up this board and chip.

Tried other BIOS's. They are actually cause more problems and don't fix the voltage problem. The latest BIOS has a CPU-NB frequency multiplier cap of x12, totally worthless.

I think it's something to do with the Turbo core feature trying to bump voltage (even when it's disabled), but I haven't totally figured it out yet. Regardless, it's not impeding my overclock. I can do 4.0GHZ stable @1.4875v (set in BIOS) even though board raises volts to 1.525v under a prime95 torture test. CPU-NB is rock solid 3.0GHZ @1.35v.

You can see the voltage fluctuation in CPU-Z and HW monitor, and if you look at CPU data in the BIOS it shows core voltage (the manual setting) and the CPU VID (what it raises to under heavy load), although you won't see this difference in Core Temp or AMD Overdive.

Maybe this has something to do with the AM3+ ~
I also updated the BIOS to version 1.82, but this also didn’t fix the Vcore voltage increase under load in Windows, so I went back to 1.80. I didn’t even know we could check the Vcore in CPU-Z, I’ll check it out tonight once I’m home.

The weird thing also is that even at 1.59v (under air) my temps usually stay around 53c and I didn’t’ see them go past 55c when running prime. I doubt the heat sink is the best in the world so this also leads me to believe that the voltage indicated in windows is exaggerated. If I set the Vcore in the BIOS at 1.48 (like yours), my Vcore under load in windows will go up to 1.59…. 1.60, that’s a 0.12v increase ???, and your goes up 0.05v…. this just seems completely ridicules to me and makes no sense.

I noticed however that if I try to disable ACPI in my BIOS that windows will not load up. I wonder if this could have anything to do with it.
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post #14 of 32
Sounds like a really ridiculous amount of voltage is being applied by the LLC.
post #15 of 32
Thread Starter 
I'm actually starting to wonder if I should just enable turbo core, and manually set the baseline speed at 3.6Ghz, and then simply set the turbo speed at like 4.0Ghz, then adjust the Vcore to the baseline minimum I need to run 3.6Ghz.

I can test this out tonight, but would I get the same performance out of this type of setup compared to a standard 4.0Ghz OC?
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post #16 of 32
Thread Starter 
I think I just figured out what is causing this vcore increase under load, its called DrMOS.

Its a feature that controls, green power, Xpresscool and Rapid Boost for this MSI board.

I'm starting to wonder if there is a way to maybe disable this feature in Windows 7 instead of the BIOS, this could be part of the Chipset drivers in Windows.
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post #17 of 32
Thread Starter 
For those interested.

Its called active phase switching, its part of the Drmos feature with these boards.

http://br.msi.com/index.php?func=newsdesc&news_no=724
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post #18 of 32
The latest update for my mobo incorporated ''Disables APS when overclocking", I assumed this was relative to all boards, or something missed on mine.

Forward it to MSI support, hopefully they'll include the same or something.

In truths, I disabled APS and never had a problem with overvolting, that I'm aware of. Other than (what I considered) normal deviations, I should check again when I do something about actively cooling my MOSFETS, before I upgrade boards.
 
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post #19 of 32
1.55v is the highest you should go.
    
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post #20 of 32
1.55v is already pushing it...
 
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