Higher overclocking seems to impact real-time performance negatively on 9800X3D, causing more game stuttering, instability, and crashes. It appears that a certain point results in diminishing returns and poor overclocking expected results. I'm quite sure 9950X3D will behave the same possible even worse due to higher core count and more temp to deal with. Anyway, good luck in "cooking" your 9800x3D, that said 5.7+Ghz is quite impressive although overall results may be disappointing at that speeds.
Yes, it definitely affects multi-thread performance. I’ve noticed no gains in that area starting around BCLK 102.5-103 (depends on BIOS version) and even slightly worse performance starting at 104.5, though only by about 1-3%. However, single-thread and memory performance keep improving at 107 BCLK, and I haven’t noticed any stuttering. That’s probably because, as I increase the BCLK, I also tweak down memory speed, Infinity Fabric, as well as keeping my memory from reaching impossible speeds and ensuring fabric doesn’t exceed 2200 and the CO curve.
I feel like that last setting is often overlooked in overclocking, you really need to adapt it. From my experience, I stick with the same CO between 100-103.5 (-40), then adjust to -45 for 104-106, and -50 for 106.5 and above. Mainly due to the motherboard's excessive voltage delivery when increasing Bclk on Auto or using AMD Overclocking Auto. A fixed voltage setting is rarely effective on that chip, it needs to stretch its legs and settle down from time to time.
It has been 2 days at that frequency without any crash or stutter in my benchmarks, sim racing games, or Assassin's Creed. However, the boost speed is rarely above 5688 MHz. I do get a few spikes at 5729 MHz, but 5750 MHz only occurs in benchmarks.Notice that at 107 BCLK, the real clock with max boost and PBO should be around 5800 MHz, but it never really gets anywhere near that speed.(only once I saw it boosts at 5779 mhz, but for a very brief moment)
You do have to know your memory speed and Infinity Fabric's max operating speed to achieve that. This also implies testing those settings until you encounter crashes or stuttering. From my tries, I've learned that setting the memory speed too high mostly leads to stuttering, while pushing the fabric speed too high results in crashes.
PS: Note that these high BCLK values were impossible to attain with BIOS A2xx, 105 BCLK was the last frequency at which the system would post with those BIOS versions. But with BIOS A33, I’m curious to see the max BCLK I can reach. So far, I’ve hit 107.5, but I haven’t tried going higher....yet
Also you're probably right, the 9950x3D should not be as fast game wise, but multi-thread wise it's a monster.
Edit: At 107.5 it does spikes @ 5831 mhz !
But only single-thread is over the roof :
@108 bclk , everything still stable, but it wouldn't pass Y-cruncher for now. Amazing how high that board can go without destroying my nvme drive... just did a scandisk to make sure, and absolutely no error on the drive Oo.
