Discussion Overclocking leashed Raptors

[Kocicak]

I spent some time playing with my 13600K and 13700K processors power limited to 180W to match my air cooler. Overclocking was just quick, I randomly added some small voltage bumps, I did not try to really find how low these need to be, just once I needed to raise one. I also did not try too many combinations or P and E core frequencies, in case of 13700K it had no sense anyway, because of the power limit.

Here are some percentage differences between processors, recorded are also frequencies they ran at. It seems that there is still some room to exploit even in power limited processors, and 4 or 8 thread benefit of extremelly heavy CNB thread translates to more threads of more normal load. Unfortunatelly the voltage offset brings performance drop to 13700K at higher thread counts

I did this to decide, which CPU should I keep, but things got complicated, because my 13700K seems to be able at lower thread count to run better than stock 13900K. So I still dont know, which one to keep.

I repeated the highest OC at 210W limit, more is simply impossible on my air cooler.

One more thing: I believe it is important to test the processors at more load intensities than just one and maximal number of threads! These are just two extremes, but the "real life" happens most of the time between these two thread counts! I understand that that would bring more work to reviewers but it would be worth it IMO.

 

[nicalandia]

Thanks for sharing, we appreciate the time invested.

 

[Kocicak]

I explored highest end of what my 13700K can do and it cannot reach 6200 MHz at the same conditions as the 13900K could. I do not feel comfortable testing the CPU at 1.5V. It seems to run at 6000 MHz fine. I am considering running two green settings. If 13600K can do all cores stable at 5700MHz at similar voltage, I may even keep only that CPU, I still need to test that, but I somehow doubt that.

Does anybody have an experience overclocking 13600K?

 

[Kocicak]

I explored the OC benefits of 13600K a little bit more, 56/42 setting seems to have a good balance - 10% boost at lower load and only little drop at 100% load.

 

[coercitiv]

I explored the OC benefits of 13600K a little bit more, 56/42 setting seems to have a good balance - 10% boost at lower load and only little drop at 100% load.

I suggest you start looking into Advanced Voltage Offset and how to make this work to get the best OC performance on a few threads while also increasing MT performance in full load scenarios. The worst case scenario should be using stock voltage for nT loads, but there's clearly room for undervolting too.

The article I linked above explains it very nicely:

The Advanced Voltage Offset function is commonly used in two ways.

1. First, you configure a positive voltage offset for the highest V/f point. This helps achieve a higher single-threaded boost frequency.
2. Second, you configure a negative voltage offset for the second-highest V/f point. This helps achieve lower voltage for all-core boost, which results in a lower temperature in all-core boost, and thus potential additional overclocking headroom.

I haven't checked on what has changed/improved with Raptor, but this functionality should be there, probably even improved a bit. Better handling of the last 4 V/F points would be nice. The resulting OC performance should always be above stock.

 

[Kocicak]

Thanks for advice. The CPU seems to be switching between 1100 MHz (with low voltage) and max frequency, with the frequency being lowered just at high load due to hitting the power limit. I do not expect to run this CPU at high load and hitting the power limit often.

I believe such complicated adjustment of the whole voltage curve would be beneficial for me, if I was buiding some small computer with very limited power budget.

 

[Kocicak]

I picked up a second 13900K and finished my comparison. Hope somebody wishing to run these processors under air cooler with sensible maximal power draw finds this useful.