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post #1 of 14 (permalink) Old 12-31-2019, 10:23 AM - Thread Starter
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NB frequency max voltage

So my quest since I got my cpu was to be 5ghz stable under 1.36, I knew it wasnt the best chip when I put her in and fired her up to find the first true stability @ 4.8 1.2 ish where it sat at most of its life the past year, till recently....
Well now I am almost there FINALLY, but now my bottleneck is the NB frequency, currently stable 5ghz @1.36 (averages 1.34 with vdroop), NB frequency 3600 1.2v, now before i start upping my NB voltages to around 1.3-1.4 to get a higher NB frequency at 5ghz, what would the safe nb voltages be on main rig in sig ?. Since I have no thermal readings for the NB, it's kinda hard to know what the max limits is without it.

It's taken me a good few weeks dedicated to overclocking this machine to find all its faults and flaws, it doesn't like high nb frequencies, it doesn't like VRM temps going above 62c it will randomly crash at anytime, this was the hardest to find as it was giving false positives, also windows disk powersaving was giving random lockups alongside drivers being unstable (looking at you logitech). All these extra problems really made it hard to find stability on anything over 4.8, @ 4.9 it would crash after 30 mins prime avx, @ 5.0 it would crash after 5-10 mins prime avx no matter the settings (i was pushing up too 1.4v through it just to see) but now i'm so happy I have finally got there, now to tweak the NB frequency lol.
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Last edited by Comatosed; 01-02-2020 at 05:00 AM.
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post #2 of 14 (permalink) Old 01-02-2020, 05:01 AM - Thread Starter
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I'm still having issues trying to find stability over 3600 NB frequency, which voltage in BIOS is tied directly to the northbridge, is it SA or VCCIO ? or am i adjusting wrong values and it's neither of them lol

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post #3 of 14 (permalink) Old 01-02-2020, 05:46 AM
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Northbridge is Cache/uncore. And no, it's not a bottleneck, ever. There's barely ever any gain from raising it, 5% is a dream improvement.

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post #4 of 14 (permalink) Old 01-02-2020, 06:30 AM - Thread Starter
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Well auto wants to set it at 4300 which crashes prime95 within 3 mins, when I manually set it at 3600 it takes 45 mins before prime95 shows an error which is really throwing my o/c testing off, I'm currently testing 3400.

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Last edited by Comatosed; 01-02-2020 at 06:33 AM.
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post #5 of 14 (permalink) Old 01-02-2020, 06:33 AM
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Mister. It's not because of its frequency, but because your Core or cache voltage is too low.

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post #6 of 14 (permalink) Old 01-02-2020, 06:53 AM - Thread Starter
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I'm pretty certain my vcore is stable, which leaves the cache voltage.
I know my cpu is stable @5.0 1.36vcore (i have even raised it to 1.37 to be sure), currently trying to over clock the RAM but first I'm trying to be stable on the NB frequency so all my roundup errors are related to my RAM o/c but right now they are related to my NB frequency, now you have helped me narrow it down to the cache & voltage. so is my cache voltage controlled by both the SA and VCCIO or neither ?
So far i know the VCCIO is the voltage for the memory controller, i'm still researching what the SA voltage does but right now i have them both at 1.16, I have tested up to 1.2 but still getting roundup error after 45mins prime.
Memory passes memtest86 too even with my oc setting, native 3000 cl15-17-17-35, was in testing to 3200 cl15 18-18-36 by just raising the ram volts +0.010 or at least I thought I was, so back to 3000 for this stability test.

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Last edited by Comatosed; 01-02-2020 at 07:27 AM.
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post #7 of 14 (permalink) Old 01-02-2020, 07:00 AM
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Someone is going to kill you for continuing to call the CPU Cache speed as the NB frequency. Lol.

Your core voltage is also your cache voltage. If you're crashing at higher cache speeds that means the core voltage needs to go up. 1.15v VCCIO/SA is standard unless pushing high DRAM speeds.

Sacrificing your cache speeds down so low for more core speed isn't the best idea, imo. I know a lot of people say it's useless to OC the cache, but balance is best in all things. I'd try to get stability at least at 4300 on the cache.
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post #8 of 14 (permalink) Old 01-02-2020, 07:07 AM - Thread Starter
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Thank you so much for explaining that to me, i'm old school, my overclocking was always done on the BCLK lol I understand that now, I was getting so confused and thrown off because if I raised the SA and VCCIO voltage, it would take longer for the instability to show so I naturally presumed it was related to that.
Now to go back into BIOS ready for another prime95 test, my poor cpu has been at 100% solid past 2 weeks, at least i know i'm not getting any degradation at 1.37. time to go 1.38.


EDIT* Just realised i was at 1.36, currently testing 1.37 but I feel it will go an hour plus on P95 now with your insight. I will leave it till it errors. I really wanted to get stable @1.36 but i guess under 1.37-1.38 can't hurt, temps just barely touch the 80's on full AVX on 2 cores, rest are 70, the lowest core temp is the one that errors :|

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Last edited by Comatosed; 01-02-2020 at 07:19 AM.
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post #9 of 14 (permalink) Old 01-02-2020, 08:31 AM
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Quote: Originally Posted by Comatosed View Post
Thank you so much for explaining that to me, i'm old school, my overclocking was always done on the BCLK lol I understand that now, I was getting so confused and thrown off because if I raised the SA and VCCIO voltage, it would take longer for the instability to show so I naturally presumed it was related to that.
Now to go back into BIOS ready for another prime95 test, my poor cpu has been at 100% solid past 2 weeks, at least i know i'm not getting any degradation at 1.37. time to go 1.38.


EDIT* Just realised i was at 1.36, currently testing 1.37 but I feel it will go an hour plus on P95 now with your insight. I will leave it till it errors. I really wanted to get stable @1.36 but i guess under 1.37-1.38 can't hurt, temps just barely touch the 80's on full AVX on 2 cores, rest are 70, the lowest core temp is the one that errors :|
Please stop using HWmonitor. It's cringeworthy seeing "VIN3 VIN4 VIN5" and strange random silly voltages no one knows what it's reporting.
use HWinfo64. That's what people use these days.

VCCIO controls the memory controller and shared L3 cache voltage. This is important on hyperthreaded cpus. Yes, your system has L3 cache and that's used, but you're forgetting about the L1 and L2 cache. L1 and L2 are directly controlled by Vcore. Raising VCCIO (VCCSA must be slightly higher than VCCIO) may help slightly, usually up to 1.2v (it helps the memory controller/IMC more) but after this point you gain more by upping vcore, if going past 1.25v VCCIO doesn't do anything anymore.

Upping PLL Termination Voltage (aka VTT, sometimes called VCC VTT; note this is not CPU PLL voltage or CPU PLL OC Voltage (PLL Bandwidth on Asus boards)) to 1.20v may allow you to maximize your cache ratio on ambient cooling. DDR VTT is not the same thing.

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post #10 of 14 (permalink) Old 01-02-2020, 09:47 AM - Thread Starter
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Thanks for all your input guys, it seems this cpu+mobo is needing around 1.4vcore to be 100% stable for 5Ghz (without sacrificing NB frequency) which is a tad too high for me 24/7, i'll dial it back to 4.9 and fine tune that more which needs around 1.33.

EDIT* So testing SA to 1.25 and VCCIO to 1.24, I did just have it at 1.2/1.19 but still error'd in prime @ 50 mins, went to 1.22/1.21 then lasted 1hr 10 mins, so deffinitely onto something here. BIOS auto wants to set VCCIO @ 1.30, no idea what it sets SA at as it doesn't show. so staying under 1.30 for VCCIO is ideal.

EDIT2* Well it seems 1.25 SA and 1.24 VCCIO had an averse effect and crashed prime 95 within 20 mins, it seems now 1.22/1.21 is the sweetspot and my vcore was way off, what I thought was stable on 4.9 isn't, I do recall not doing a long P95 test but just to see, I set same Vcore as I was testing with 5.0 which is now 4.9 @1.36, spikes to 1.37 and currently 3hrs into P95 blend full AVX no problems so far.
Now i'm thinking if 5.0 @ 1.39 (spikes to 1.4) is not so bad overall, especially being stable 4.8 @1.30 ish, which is another freq I need to retest after these results, so that is more than likely closer to 1.32. The other thing I do dislike is the vcore reading in increments off 0.076

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Last edited by Comatosed; 01-02-2020 at 04:47 PM.
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