Played around with BCLK after setting my 9800X3D to CO -45 (just for Cinebench fun).
Anything past -50 caused clock stretching, so -45 seems to be the limit for my chip.
On ASUS/MSI you can isolate BCLK to the CPU, but Gigabyte ties it to the whole system. Because of that I could only go up to 104 — anything higher throws AIDA errors within 5–7 minutes.
At 104, it boosts past 5.5GHz (vs ~5.42GHz stock), but it’s not stable enough for daily use so I didn’t keep it.
Since BCLK affects everything on Gigabyte, I had to retune other settings too (FCLK 2200 → 2067, RAM 8000 → 7600).
Without touching those, 102 BCLK was the highest stable point on my setup.
Stock max boost was ~5425MHz, but at 102 BCLK I’m seeing 5510+.
If you’re on ASUS/MSI, having CPU-only BCLK control probably makes undervolting/OC way more enjoyable.
I’ll likely switch to one of those next time.
Anyways, if you’ve got thermal/voltage headroom, definitely worth trying BCLK for fun — it’s cool seeing what your chip can really do 😄