i get 4.3 with pbo and that 4.5 with x45 multiplier is unstable the best i can get truly stable is 4.4 any other help guys?
A REV number of '1001' suggests an early-release BIOS, and so also an early AGESA release. Go look for a BIOS on the ASUS website and look for AGESA 1003ABBA just to be sure.
All-core overclocks at or near the max-boost clock on Ryzen 3000 are very difficult to get stable without extreme cooling. And if you can't get to rated clock then you're effectively killing the performance benefit of boost clocks.
So what is your use-case? If you are optimizing a gaming system, for instance, then you really do not want to all-core overclock because 3800's will eagerly boost to rated clocks on single cores as needed in games. With PBO enabled and a mild positive offset for voltage you might even get boosts above rated boost clock since 3800's often get the very best-binned CCD's.
If you're going to do extremely heavy all-core tasks, something like encoding or rendering, then you might benefit from a manual overclock even if not close to max boost. But you will need very good cooling..a Noctua NH-D14 or a 240mm AIO at least.
It's often beneficial to have a BIOS profile saved for each scenario if you do both.
PBO is enabled by first leaving the CPU multiplier in AUTO, and VCore in AUTO. Usually something like an ADVANCED CPU settings section there's PBO settings: put it in MANUAL and then push the three parameters to max: TDC, EDC and PPT. Then I also set PBO SCALAR to manual and set a scalar to 6x-8x, but you can also go up to 10x.
EDIT add: FYI, some stats from Silicon Lottery (
https://siliconlottery.com/pages/statistics ) on 3800X overclocking:
.........................non-AVX...................... AVX
3800X | Not Tested | 4.20GHz | 1.275V | 100% |
3800X | Not Tested | 4.25GHz | 1.287V | Top 53% |
3800X | Not Tested | 4.30GHz | 1.300V | Top 20% |