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1.35v Haswell vs 1.35v Skylake

TechyInAZ
By TechyInAZ
in CPUs, Motherboards, and Memory
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Why is it so much safer to run Skylake/KabyLake on 1.35v but Haswell/Devils Canyon it's usually not recommended? I already know that usually it's temps, but i'm talking about pure voltage, not temps as the problem.

 

I've heard that voltage kills more than temps, which is why i'm asking.

 

I have a 4690K at 1.25v at 4.5ghz, I have gotten it to 4.7ghz at 1.35v, but didn't want to since I heard that it's too high of a voltage. Just trying to discern if they mean because of heat, or because of too much voltage.

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At a high enough voltage, regardless of temperature, it just destroys the chip.  Just look up any of the many videos of people putting too many volts through some sort of electrical component to see what I mean.  Why does Skylake have a higher voltage tolerance than Haswell when generally the trend is toward lower voltages over time?  That I can't answer... :/

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1.35V is nothing.  And no, the fab process hasn't really lowered the max voltage at all.  It's been the same since Ivy or Sandy thru Cannonlake.

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So you won't get electromigration with 1.35v?

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1 hour ago, TechyInAZ said:

So you won't get electromigration with 1.35v?

The common figure is that 1.35 v is the maximum safe 24/7 voltage for Haswell, assuming your cooling is sufficient.  It's not going to instantly die if you go above that, but it's not recommended for long term use, and would require extreme cooling.

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Probably draws less current even at high voltage because of the small more efficient process. 22nm vs 14nm, also hasweasel has that crappy on cpu vrm so that probably can't handle too much power. 

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Thx guys! So here was my test run of 1.35v 4.7ghz. How do the temps look? Keep in mind, I've got the fan curve really low so I can up the fan curve if necessary.

https://cdn.discordapp.com/attachments/267194050896068609/283355293004333056/unknown.png

 

https://cdn.discordapp.com/attachments/267194050896068609/283356764550725632/unknown.png

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1 hour ago, TechyInAZ said:

Thx guys! So here was my test run of 1.35v 4.7ghz. How do the temps look? Keep in mind, I've got the fan curve really low so I can up the fan curve if necessary.

https://cdn.discordapp.com/attachments/267194050896068609/283355293004333056/unknown.png

 

https://cdn.discordapp.com/attachments/267194050896068609/283356764550725632/unknown.png

Tag people so they get notified, unless they follow the topic then they get notified by default. Or quoting people also get notified too

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3 hours ago, TechyInAZ said:

Thx guys! So here was my test run of 1.35v 4.7ghz. How do the temps look? Keep in mind, I've got the fan curve really low so I can up the fan curve if necessary.

https://cdn.discordapp.com/attachments/267194050896068609/283355293004333056/unknown.png

 

https://cdn.discordapp.com/attachments/267194050896068609/283356764550725632/unknown.png

Wow, looks good :) 

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That was an XTU test though, I wonder how linpack would do.

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6 minutes ago, TechyInAZ said:

That was an XTU test though, I wonder how linpack would do.

I think that's good enough.  It's about as intense as anything else you would run, other than the unrealistic tests like prime95

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Right. Though I'm probably gona stick to 4.5ghz for now as I don't need the extra performance.

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@Ryan_Vickers So would you say that 1.35v with a temp lower than 70C won't cause CPU degregation? I've also heard that if you run very low temps, you can get away with even higher voltages than the max recommended.

 

Sorry for being so specific, I'm planning to make a CPU degregation thread on Tom's Hardware to help people figure out precisely when a CPU will start degrading. 

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21 minutes ago, TechyInAZ said:

@Ryan_Vickers So would you say that 1.35v with a temp lower than 70C won't cause CPU degregation? I've also heard that if you run very low temps, you can get away with even higher voltages than the max recommended.

 

Sorry for being so specific, I'm planning to make a CPU degregation thread on Tom's Hardware to help people figure out precisely when a CPU will start degrading. 

Well both higher temps and (to a greater extent I believe) higher voltages will both cause faster degradation, but how severe this is at different levels I honestly don't know.  I think it would be fascinating to grab 200 7700ks (or any CPU for that matter) and run groups of 10 under different conditions at full load until they die, as shown here:

Capture.PNG

We could then get an idea for what does what to their lifespan.

 

Obviously a powerful cooling solution would be needed to get 1.5 v at 50 C load xD but it could easily be done a number of ways, from using a room with very low ambient temps, to some sort of exotic method like LN2 or dry ice.  I know people run them at well below 0 so 50 should be no problem with the right equipment.

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Linus!! Please buy 200 7700ks and do what Ryan is suggesting! :D

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