How low can I set CPU PLL voltage on a Intel Core i7 980X for 24/7 usage?

Sylver123

Sylver123

Sylver123

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Hi

I have read on hardware forums boards that lowering the CPU PLL voltage from the default 1.8v can greatly help stabilize a overclock without needing as much CPU VCore but I have also
heard that lowering the CPU PLL too much can kill the CPUs life span or damage it etc, so I was wondering how low should I lower this for 24/7 usage that should be completely safe?

I have read about people that have the CPU PLL voltage on this chip down at 1.45v for 24/7 usage but i`m still unsure that would be safe.

Thanks for responding.

Sylver123.
 
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How does lowering voltage damage the chip?

I did drop my D0 i7 to 1.4 to help get stable on 4.3Ghz, im you look in the last couple of pages on XS forums in the rex3 thread there are some tips
 
How come lowering the CPU pll increases stability? This is new to me and thought the opposite was true. Have you a linky to educate me?
 
Is having the CPU PLL at 1.45v or just above this for 24/7 usage completely fine on this chip or should I leave it at its defaults?

Thanks for responding.
 
Completely fine. It's similar to how QPI affects stability. You need to find the sweet spot. For me CPU pll 1.6v whereas stock it's set to 1.8v.

Lowering the pll will not damage the chip, the only way this wil happen is if people set it so low they use excessive vcore or QPI to comensate.
 
w3bbo said:
Completely fine. It's similar to how QPI affects stability. You need to find the sweet spot. For me CPU pll 1.6v whereas stock it's set to 1.8v.

Lowering the pll will not damage the chip, the only way this wil happen is if people set it so low they use excessive vcore or QPI to comensate.
Click to expand...

Thanks mate for the straight answer.;)
 
Just checked my board and BIOS won't allow any settings lower than stock 1.8v. It auto corrects back to 1.8 when I manually adjust the setting. :(

Sounds like this could be an interesting tweak to play with.
 
it's all dependant on the specific chip you're using tbh guys, with my current chip on a UD5 I could get it to 4.4GHz stable 24/7 because I was able to lower the CPU PLL to 1.3v, but on this darn RIIE mobo I replaced my UD5 with it doesn't allow you to lower PLL any further than the default 1.8v, it can only be raised, so I can't get the chip to run at 4.4GHz stable on the RIIE.

Yet I can drop the chip into the missus' rig which uses a UD5, and use all my old settings and lower PLL to get the chip stable at 4.4GHz.

I have spent ages trying to get it to 4.4GHz on the RIIE but it just doesn't want to happen
 
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