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CPU now stable with 0.10v drop..?!?!

post #1 of 9
Thread Starter 
I was playing around with clocks / voltages like I always do, and found that VRM frequency greatly improved stability when increased above 350. I have a range of 300-500 on my P8P67 Deluxe. First I accidently set the frequency to 300 resulting in no post. I then tried 500 for the hell of it just to see how it affected stability.

I started off with 4.8Ghz @ 1.6v at load with a 350 VRM frequency. -*not a typo*

With a 500 VRM frequency, I'm stable at 4.8ghz w/ 1.5v under load on the initial stability testing. So I can probably go a little lower.

Not bad! Same clocks with less heat and a 0.1v drop. Just a little tip for you guys, I would highly suggest playing with the VRM Frequency if you're having trouble getting higher clocks. thumb.gif
post #2 of 9
Thanks, I'll look into this with my own hardware.thumb.gif
    
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post #3 of 9
Thread Starter 
Yeah, its worth a shot. From reading over the Sandy/Ivy overclocking guides, 350 is the recommended VRM frequency but every chip is different. In my case at least it made a huge difference.

I'll post results with lower voltage and/or higher clocks.
post #4 of 9
Thread Starter 
Well, I wasn't able to clock any higher, but either way I'm still happy with the 0.10v drop. IBT passed 10 runs on Max, and Prime passed 12 hours on blend as well as random surfing, gaming etc.

Its only a 0.10v drop, but it shaved about 10c off max temps (mid 90's after 12 hours of prime), so I'm happy with it. smile.gif
post #5 of 9
I guess I'll have to fiddle around with this after I delid and go for 5Ghz. I respect you for pushing your chip so hard with that cooler!
     
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post #6 of 9
Thread Starter 
Thank you. thumb.gif

Everyone seems to think Ivy's cant handle voltage, but they can take a beating. I've been running well in excess of 1.5v for months with no degradation at all. I even ran it for a few days with 1.7v @ 4.9Ghz just to see if it would handle it, and sure enough it did. The previous owner ran it under LN2 straight out of the box, and I've ran it up to 1.9v on ice water and its still going strong.

I only lowered voltage out of fear of catching the board on fire, lol.

On a side note, I also just finished upgrading a family members setup. It uses a P8P67 Pro with a Celeron G530. I tried the 500 VRM Frequency and sure enough, I was able to under-volt it down to 0.90v under load. I can probably go lower, but it only uses like 40W running Intel Burn Test.
post #7 of 9
Thread Starter 
Just found another interesting fact!

Reported voltage using software related programs = 1.52v Load using IBT

Reported voltage using a multimeter = 1.72v Load using IBT devil.gif

Wow! And to think I was running about 1.6-1.62v under load before. So that would around 1.8-1.82v for at least 4+ months of daily usage.

I guess that goes to show you how resilient these chips are.
post #8 of 9
jees 1.8v is miles too much voltage! No wonder your cpu was stable at 4.8ghz
post #9 of 9
Thread Starter 
To be honest with you, I'm thinking the physical reading might be wrong as well. 10 runs of IBT with < 100c @ 1.72v doesn't sound right. Granted, I'm using Liquid Ultra, de-lidded and lapped with water cooling but still, 1.7v should easily be hitting thermal throttling.
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