Processors

[Eagle74]

My system has run well for 3 years with a -15 in curve opt.  Yesterday I decided to try & squeeze a bit more performance out of the CPU.  I bumped up the PBO limits PPT 85w (default 76), EDC 110 (default 90).  Left the TDC at the default of 60 since I've never seen it get close to that running Cinebench 23 MT.  And I set the auto OC to +200 MHz.  CB 23 results were disappointing: 2% improvement for ST & <1% for MT.  The system ran the MT test at the EDC limit of 110 & the PPT was about 83 watts.  Max CPU temp for the MT test was 74 C versus 69 C with default settings.  I quickly decided that the MT results were not worth the hassle & set the PBO limits back to default. 

I left the +200 auto OC to keep the ST improvement.   The system had a kernal power event & rebooted earlier today (the 1st one ever with the -15 curve opt setting).  It's apparently not stable with these settings.  While you could back off the curve opt settings, that seems like you are giving back some of the ST improvement.  Suggestions?

Specs: Win 11, GB B550 Aurous Pro V2, R5 5600x, RTX 3060 Ti, 32 GB DDR4 3200, 2 TB SATA SSD, Noctua NH-D15s.

[FunkZ]

-15 CO seems a bit conservative, have you tried lower? Also raise that PPT limit up.

I have a 5600 (non-X) running -30 CO, PPT 100 and +200 OC on a Kraken AIO. It gets 4650MHz all-core on CB23.

Also have a 5700G and a 5700X both running -25 CO.

[Eagle74]

After building the PC in 2021, I ran -20 CO for the 1st couple of months.  It ran OK 95% of the time but would spit out a kernal power event & reboot every now & then.  While -15 runs rock solid with the default limits.  IDC that much about all core performance as I don't do any heavy productivity work.  Raising the settings to 85 PPT & 110 EDC didn't hit the 85w PPT limit when running CB R23.  It hit the 110 EDC limit 1st & for virtually no improvement. 

But I would like to get a boost on ST/core or even a few cores especially if it's free.  Per my previous post -15 CO & +200 OC is not running stable for me.  I may raise the CO to -10 & see if it's stable & keeps the gains.    

[FunkZ]

EDC doesn't matter if it's hitting 100%

What is your core voltage at running CB multi-core and -15 CO?

At -30 CO mine hits 1.25v @ 4650MHz

 

[Eagle74]

I set 85w PPT, +200 OC, -10 CO & left the TDC, EDC at default settings.  Core voltage was 1.30-1.35 running CB R23 MT.  Tried to run it again with -15 CO but the system rebooted during the test (kernal power).

BTW IDK how to capture a pic of RM & post it here.

[FunkZ]

Alt+Prtscrn to capture the active window. Then Ctrl+V to paste it here.

What motherboard? Have you adjusted the Scaler or any other PBO settings?

[Eagle74]

Mobo GB B550 Aorus Pro V2.  Scaler is set to manual 10x.  The only other OC is RAM 3200 with XMP1.

[FunkZ]

Leave Scaler on Auto, then see if you can set CO lower.

 

[Eagle74]

I updated the chipset driver earlier today.  Set -15 CO, 85 PPT, +200 OC, scaler to auto & left the others at default.  My bios screen looks the same as yours posted above except for the PPT & CO offset. But RM shows the PBO scaler as "off."  Double checked it in the bios & it is set to auto.  Anyway, the system ran both CB R23 ST & MT without issues.   It gives a 3% gain over stock for ST, but only 1.5% for MT.

[FunkZ]

Did you try to reduce CO since reverting Scalar to Auto?

Temp looks fine but PPT is maxing out 100% at 85W and it's using 1.35V at 4.5GHz - if you can use lower CO stable it should bring down PPT W & Core V and allow higher boost frequency.

[Eagle74]

Tried to run the test at -30 & -25 CO but the system rebooted (kernal power) in both cases.  It ran OK at -20 CO for a 3.3% gain on ST & 2.3% on MT.  The question remains if this will be stable long term.  Thanks for all your help with this.

[williamwalker]

Focus on Curve Optimizer for ST: +200 MHz Auto OC might be pushing it a bit. Consider dialing back the Auto OC and focusing on further refining your Curve Optimizer for single-threaded performance. You might be surprised what you can squeeze out.

[Eagle74]

Thanks.  The system rebooted (kernal power) shortly after my last post at -20 CO, 85 PPT, +200 OC.  So, I decided to quit chasing MT altogether & set -15 CO, PBO default, +200 OC.  If it doesn't run stable at that I will back off the OC a bit as you suggested.  Here's my current settings: