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Does Hyper Threading Affect Overclocking Stability? - Page 2

post #11 of 20
Quote:
Originally Posted by CynicalUnicorn View Post



Better? Anyway they're incredibly closely tied together in solid-state components.

 

All I'm saying is that if the CPU requires more power when you make a change, then that means you either lower the clock or increase the core voltage.

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post #12 of 20
Quote:
Originally Posted by TwoCables View Post
 

 

lol I know more power equals more heat, but I'm obviously saying that more power required means you either need to reduce the clock or increase the core voltage.

Not if your cooling can handle it. If your cooling can handle 10GHz at 2V, then you can do 10GHz at 2V.

 

I did misread that at first.

post #13 of 20
Quote:
Originally Posted by TwoCables View Post

All I'm saying is that if the CPU requires more power when you make a change, then that means you either lower the clock or increase the core voltage.

See edit:

Quote:
Originally Posted by CynicalUnicorn View Post

P = I*V, power = current * voltage. If the VRMs can spit out extra electrons, then voltage does not need to be touched. Simple as that really.

Power is proportional to current and to voltage. If voltage is fixed, higher current is needed. If the VRMs can supply that, voltage is untouched. If they can't (fairly unlikely unless they're pushed to their limits) then yes, voltage will need to be increased.
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post #14 of 20

I'm just making a simple statement. Geez.

 

The question was, does enabling HyperThreading affect the stability? Well, it might because HyperThreading needs a slightly higher core voltage. If you enable it after stabilizing your CPU at a certain clock and voltage, then you might need to increase the core voltage or slightly lower the clock voltage. It's all very simple.

 

Simple question, simple answer, no need to say anything more complex than this.

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post #15 of 20
Quote:
Originally Posted by CynicalUnicorn View Post

Power is proportional to current and to voltage. If voltage is fixed, higher current is needed. If the VRMs can supply that, voltage is untouched. If they can't (fairly unlikely unless they're pushed to their limits) then yes, voltage will need to be increased.

 

I should point out that there is also voltage drop from the VRM output to the die that isn't perfectly even (vias on the processor PCB, PCB interconnects to the die, then the actual metal paths in the die itself), that while not largely significant, can have an impact when on the quest for the ultimate performance.

 

It likely isn't very relevant in this scenario, but the added load of the logic behind HT can cause additional voltage drop that isn't necessarily on the VRMs themselves, so to a certain extent, you can compensate the impact HT has by bumping the voltage a notch.

 

Achieving true 1:1 parity HT on vs HT off is highly unlikely though.

   
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post #16 of 20
Dosen't seem like anyone is fully sure on hyper threading affecting oc stability,

The op should run prime and see if he can get extra ghz oc while he turns hyper thread off, while running the same voltage, and it would answer the question from him
post #17 of 20

Short answer? Yes it does.

 

Long answer? Read what's been said :p

   
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post #18 of 20
Quote:
Originally Posted by Artikbot View Post

I should point out that there is also voltage drop from the VRM output to the die that isn't perfectly even (vias on the processor PCB, PCB interconnects to the die, then the actual metal paths in the die itself), that while not largely significant, can have an impact when on the quest for the ultimate performance.

On one hand it's a very short distance, but on the other hand, the current is going to be, what, 100A? 150A for some of the more extreme chips? (Hello FX-9590!) Haswell and Broadwell have a slight advantage thanks to the FIVR (my Vin reads 1.6V IIRC, but the actual CPU voltage is about 1.1V or something), but of course the FIVR sucks and limits overclocking for other reasons.
Quote:
It likely isn't very relevant in this scenario, but the added load of the logic behind HT can cause additional voltage drop that isn't necessarily on the VRMs themselves, so to a certain extent, you can compensate the impact HT has by bumping the voltage a notch.

Achieving true 1:1 parity HT on vs HT off is highly unlikely though.

This is just Ohm's Law, isn't it? Increased current -> increased Vdrop -> compensate with a bit more voltage? That makes sense, and I was assuming ideal wires. Probably not ideal in this situation. biggrin.gif
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post #19 of 20

Also consider that you're talking about quite tight line regulations (in the order of the .1% or less for average voltage and much tighter for noise), so any voltage drop is to be taken into consideration, especially when modern processors take so many variables into account to determine turbo frequency states, load-line calibration, yadda yadda.

   
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post #20 of 20
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Dosen't seem like anyone is fully sure on hyper threading affecting oc stability,

The op should run prime and see if he can get extra ghz oc while he turns hyper thread off, while running the same voltage, and it would answer the question from him

It does affect stability, but it depends on the CPU (not just the brand and model, the specific CPU). Some will be hardly affected at all, some will have a bigger difference.

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