Anyone have any idea when this board will be released? reviewers have it, so the chances could be soon maybe?? I love the new option of being able to keep the "boost" ability even while setting a static OC... that option alone sold me on this board...
Asus Crosshair VIII DARK Hero.... Official Thread!?
newls1
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Yeah I'm still figuring out at which load all core oc is better performance/temp wise than PBO. Anyway, at 20A and hysteresis 5, DOC never kicks in for me in desktop use. That's what the hysteresis is for. It does trigger in games though which use roughly 20 - 25 % of my CPU, so that's the threshold at which I will test PBO vs DOC. Haven't got around it yet since I'm still trying to get a stable curve with CO using CoreCycler. I'm almost there, though, so I hope I can post some results on the weekend.If you set it at 20A, does it not bother you that you're almost always at max frequency?
I fiddled around with it over the weekend and I'm still adjusting but 65-75A seems all right. I want PBO in games and DOC to kick in only when heavy multi-threaded work is loaded which I never need. I play only games on this PC (5950X is being wasted here) and do everything else, web browsing, work etc on Mac.
As for the hysteresis, I have set it at 0. (I'm guessing the value 0 has the lowest latency switching back and forth).
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I've been getting CPU Over Temperature Errors when running Cinebench R23 with my 5950X at 4.8GHz and 1.25Vcore. What's odd is that none of my CPU-related temperatures peak over 85C. This is with a Heatkiller IV Pro waterblock, D5 pump, and Black Ice Nemesis 480 GTX radiator. This was sufficient to push a 7980XE to 5GHz in Cinebench and even further in other benchmarks, so this seems very odd. Is 85C the limit with this board?
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No. It's false positive. It means you need more (way more) Vcore.
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Which USB are tied to the CPU lanes? Thanks!
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It looks like BIOS 3401 is out of beta and became official.
ROG Crosshair VIII Dark Hero | ROG Crosshair | Gaming Motherboards｜ROG - Republic of Gamers｜ROG USA (asus.com)
ROG Crosshair VIII Dark Hero | ROG Crosshair | Gaming Motherboards｜ROG - Republic of Gamers｜ROG USA (asus.com)
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514 Posts
My Optimus block came in the same day, so I gave it a try with that (which yielded a 5C improvement at the settings I was testing at). I needed 1.275V for 4.8GHz all-cores in CBR23. The hottest CCD peaked just over 80C after many runs. The slightly lower temperatures probably allowed me to get away with a smaller bump in vcore.
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Cinebench, IMHO, hardly stresses CPUs.
You should try y-cruncher and/or Prime95.
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I usually use a mix of Realbench and OCCT for my stability testing. Small FFTs in Prime95 with AVX2 definitely isn't happening with 4.8GHz lol.
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156 Posts
So I've settled on the following curve with my 5800X (default boost to 4.85 Ghz): -20, -30, -23, -30, -15, -30, -10, -20.
Now I want to find my sweetspot for triggering DOC. Testing PBO in CB23 against my all core OC (x47 @ 1.31V, LLC2), at 4 threads (25 % CPU usage, approx. 40A), I gain about 2 % more points, but temps are 9(!) degrees higher. With 2 threads (roughly 20A), PBO keeps the 2 % win, while temps are marginally better this time by 1-2 °C.
Most games I currently play usually draw between 20A and 30A. The above perf/temp ratio between PBO and all core is more or less consistent between CB23 and games.
In sum, I guess my sweetspot for DOC switching would be around 25A. Since I don't want to have it switch around all the time when gaming, I'll keep it at 20A and hysteresis 5.
Now I want to find my sweetspot for triggering DOC. Testing PBO in CB23 against my all core OC (x47 @ 1.31V, LLC2), at 4 threads (25 % CPU usage, approx. 40A), I gain about 2 % more points, but temps are 9(!) degrees higher. With 2 threads (roughly 20A), PBO keeps the 2 % win, while temps are marginally better this time by 1-2 °C.
Most games I currently play usually draw between 20A and 30A. The above perf/temp ratio between PBO and all core is more or less consistent between CB23 and games.
In sum, I guess my sweetspot for DOC switching would be around 25A. Since I don't want to have it switch around all the time when gaming, I'll keep it at 20A and hysteresis 5.
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@Rhadamanthys Have you checked the stability of the curve with CoreCycler?
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545 Posts
Very interested in this, as I'm looking at the same block. What are your Prime95 AVX2 clocks and temps?
Question on this curve optimize section in the bios. I ran CRT 2.0 and during the diagnostic part it gave me the default curve's for each core. It was pretty wild actually, ranging from 20 to 0. So my question is, when we change these numbers in the bios, are they over riding the stock numbers or are they applied in addition to the stock number? For example. If the stock number for core 1 was -15, and I put -10 in the bios for that core. Is the applied curve overridden to -10 or is it now -25?
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You're modifying the stock value.
Your example would be -25, but without CTR you would never see that number, it would just be -10 to you.
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@OCmember yep I started out at -20 on all cores and then increased/decreased by 1, depending on if CoreCycler would pass or not. Great tool! Somehow I couldn't get the core cycling to work with OCCT.
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Spent the afternoon playing with IF at 1866 and 1900, as well as tighter memory timings.
To me it didn't seem to be worth the hassle: 1-2% real-world benefit vs 1800/3600.
Maybe once I get a custom loop built and can get higher clocks it will make a bigger difference, but for now I wouldn't recommend wasting the time.
To me it didn't seem to be worth the hassle: 1-2% real-world benefit vs 1800/3600.
Maybe once I get a custom loop built and can get higher clocks it will make a bigger difference, but for now I wouldn't recommend wasting the time.
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256 Posts
I'm new to this motherboard and may be blind. I can't find the Curve Optimizer in the bios. I thought it was under the PBO menu, but I don't have an "Advanced" option under PBO. Just Auto / Disabled / Enabled / Manual.
Am I doing something wrong?
Am I doing something wrong?
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691 Posts
Yes. You are obviously not looking hard enough!
Look harder and you'll see in:
Advanced > AMD Overclocking > Precision Boost Overdrive > Manual > Curve Optimizer.
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Can you use the curve optimiser and the dynamic overclock switcher at the same time? I have tried to use the DOS but my clocks drop back to 3.6ghz instead of staying at the 4.6ghz I set it to, also can you use your own motherboard power limits when using DOS
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