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  #51 (permalink)  
Old January 9, 2014, 08:20 AM
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Quote:
Originally Posted by sakage.shinga View Post
I read somewhere that Prime95 shouldn't be used on the new Haswell processors because it will overvolt them? So what else can I use to stress test my OC? How about Intel Extreme Tuning?
Sounds a bit strange to me that somebody is suggesting that prime will "overvolt" a proc.... nothing in the programming would allow it to gain bios access to do that. It is however possible they're suggesting
that any full 100% stress program is going to push the proc beyond what intel intended for extended periods of time.

Lately I've been using occt but I haven't been pushing for ultra-high OCs thus haven't been overly concerned that I would have stability issues over longer term workloads.
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  #52 (permalink)  
Old January 9, 2014, 01:41 PM
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Quote:
Originally Posted by sswilson View Post
Sounds a bit strange to me that somebody is suggesting that prime will "overvolt" a proc.... nothing in the programming would allow it to gain bios access to do that. It is however possible they're suggesting
that any full 100% stress program is going to push the proc beyond what intel intended for extended periods of time.

Lately I've been using occt but I haven't been pushing for ultra-high OCs thus haven't been overly concerned that I would have stability issues over longer term workloads.
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Newegg TV: Ivy Bridge Overclocking Guide with ASUS for Intel 3rd Generation Core CPUs 3770K Z77 1155 - YouTube
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Old January 9, 2014, 02:03 PM
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Yeah, I don't buy that. He might be right about one or the other stress tests using features that others don't, but AFAIC if he thinks one stress program is safer WRT voltage then that means the program he's recommending isn't actually fully stressing the hardware.
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Old January 9, 2014, 02:05 PM
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Sounds to me like he's covering his ass and/or is sponsored by AIDA and can't recommend "Unvalidated" solutions.
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Old January 11, 2014, 05:39 PM
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Well I did a bit more reading into this. Seems that when you input a max voltage into a stress program like Prime95,but leave adaptive voltage on in bios (?), then the cpu can and will request/receive voltages higher than your max.
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Old January 11, 2014, 06:24 PM
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Leads to reasons to lock down voltages in BIOS/

I manually set voltage in BIOS board is more stable.
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Old January 12, 2014, 12:57 AM
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Quote:
Originally Posted by ZZLEE View Post
Leads to reasons to lock down voltages in BIOS/

I manually set voltage in BIOS board is more stable.
Exactly, basically from what I've read, do your overclocking at manual set voltage (e.g. 1.25V or 1.20V), test for stability using Prime95 + AIDA64, make sure everything runs fine, and THEN, go back into BIOS and set to Adaptive Voltage and don't run more Prime95.

Also I read something that says Prime95 doesn't really test all the new instruction sets present in Haswell. What free stress tests are available that does (i.e. Haswell certified)?
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Old January 12, 2014, 08:33 AM
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Unless you are a BIOS coder, you have no idea what are the intricate relationships between the various settings and how an OS inputs changes to the BIOS. In order to fully control your overclock, one MUST use the manual option - at least for the main voltage settings (VCore, VRam, IOH, VTT/QTT). Further to this, using manual control usually results in higher, stable overclocks. Case in point, I've been playing with a L5639; fully Auto, the chip was unstable starting 3.4 GHz. Using manual settings, it is now stable @ 4 GHz.

For Haswell, use the latest LinX with AVX (0.6.6 / 11.1.1). I updated the link in the OP.
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  #59 (permalink)  
Old January 12, 2014, 12:20 PM
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Quote:
Originally Posted by 3.0charlie View Post
Unless you are a BIOS coder, you have no idea what are the intricate relationships between the various settings and how an OS inputs changes to the BIOS. In order to fully control your overclock, one MUST use the manual option - at least for the main voltage settings (VCore, VRam, IOH, VTT/QTT). Further to this, using manual control usually results in higher, stable overclocks. Case in point, I've been playing with a L5639; fully Auto, the chip was unstable starting 3.4 GHz. Using manual settings, it is now stable @ 4 GHz.

For Haswell, use the latest LinX with AVX (0.6.6 / 11.1.1). I updated the link in the OP.
Thanks!
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