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Does Hyper Threading Affect Overclocking Stability?

post #1 of 20
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I recently increased my OC on my 6700k to 4.8ghz with Hyper Threading off. I turn it off because my flight simulators run much better with it off. However, I frequently render and edit videos, create music (The whole reason I bought a 6700k), so it comes in handy

If i turn hyperthreading back on, will it make my overclock unstable?
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post #2 of 20

HyperThreading makes the CPU require more power.

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post #3 of 20
Quote:
Originally Posted by TwoCables View Post

HyperThreading makes the CPU require more power.

That's not the question. tongue.gif


It looks like yes, it can affect an overclock a bit. Not by much though. Most people are reporting a few hundred megahertz difference at worst. The real benefit is in temperatures. A quad-core with HyperThreading performs like a penta-core without in mutlithreaded tasks. Where does that extra performance come from? Clock cycles that would otherwise go unused, since the core can be fed instructions from two different sources and idles less.

If temperatures aren't a concern (and they really shouldn't be) I say go ahead and enable it and do some stability tests. If it fails, knock it down 100MHz and try again. If it gets too low for your tastes, so be it, leave HT off.
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post #4 of 20
Thread Starter 
Quote:
Originally Posted by CynicalUnicorn View Post

That's not the question. tongue.gif


It looks like yes, it can affect an overclock a bit. Not by much though. Most people are reporting a few hundred megahertz difference at worst. The real benefit is in temperatures. A quad-core with HyperThreading performs like a penta-core without in mutlithreaded tasks. Where does that extra performance come from? Clock cycles that would otherwise go unused, since the core can be fed instructions from two different sources and idles less.

If temperatures aren't a concern (and they really shouldn't be) I say go ahead and enable it and do some stability tests. If it fails, knock it down 100MHz and try again. If it gets too low for your tastes, so be it, leave HT off.
Thanks for the information!
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post #5 of 20
Quote:
Originally Posted by CynicalUnicorn View Post


That's not the question. tongue.gif


It looks like yes, it can affect an overclock a bit. Not by much though. Most people are reporting a few hundred megahertz difference at worst. The real benefit is in temperatures. A quad-core with HyperThreading performs like a penta-core without in mutlithreaded tasks. Where does that extra performance come from? Clock cycles that would otherwise go unused, since the core can be fed instructions from two different sources and idles less.

If temperatures aren't a concern (and they really shouldn't be) I say go ahead and enable it and do some stability tests. If it fails, knock it down 100MHz and try again. If it gets too low for your tastes, so be it, leave HT off.

 

But it still answers the question. Think about it. HyperThreading makes the CPU require more power. Therefore, if you enable HyperThreading, then your current voltage may end up not being enough for your current overclock which means it could affect stability.

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post #6 of 20
Heat != stability. If it did, an overclock would magically become more stable by upgrading the cooler. Voltage is going to be constant, whatever you set it to in BIOS, as long as the VRMs are capable of spitting out the massive amount of current you need. If you're dumb enough to overclock on a low-end OEM motherboard or something, then sure! It will be unstable and also burst into flames.
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post #7 of 20
Quote:
Originally Posted by CynicalUnicorn View Post

Heat != stability. If it did, an overclock would magically become more stable by upgrading the cooler. Voltage is going to be constant, whatever you set it to in BIOS, as long as the VRMs are capable of spitting out the massive amount of current you need. If you're dumb enough to overclock on a low-end OEM motherboard or something, then sure! It will be unstable and also burst into flames.

 

I am not talking about heat.

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post #8 of 20

The extra power needed for HT won't make that much of a difference with stability. Of your cooler can handle the extra heat, there is no real reason to have HT off. Just make sure that when you do overclock, you run a program such as Prime95 for a minimum of 24 hours straight. If you get any errors, then your overclock isn't stable.

 

Besides, leaving HT off defeats the point in getting an i7. You could have saved $100 and got an i5 instead.

 

 

@TwoCables More power = more heat. 

   
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post #9 of 20
Quote:
Originally Posted by andrews2547 View Post
 

The extra power needed for HT won't make that much of a difference with stability. Of your cooler can handle the extra heat, there is no real reason to have HT off. Just make sure that when you do overclock, you run a program such as Prime95 for a minimum of 24 hours straight. If you get any errors, then your overclock isn't stable.

 

Besides, leaving HT off defeats the point in getting an i7. You could have saved $100 and got an i5 instead.

 

 

@TwoCables More power = more heat. 

 

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.

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post #10 of 20
Quote:
Originally Posted by TwoCables View Post

I am not talking about heat.

Quote:
Power != stability. If it did, an overclock would magically become more stable by upgrading the cooler.

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

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.

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.
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