I’ve been using SIENAD8UD3 for about a week. Drop-in replaced EPYC 7443 and SM H12SSL-NT in a TrueNAS Core setup.
Idle power draw with 8024P CPU, 6x RAM and 2x Noctua fans was hovering between 20W and 30W measured from the EPS power cable with ElmorLabs PMD-USB. PMD-USB doesn’t account for PSU efficiency losses. I did not bother to average it out but it’s probably closer to 30W than 20W.
I have HDDs connected thru bundled MCIO → SATA cable in a flexiDOCK MB830SP-B enclosure and U.3’s (Micron 7450 Pro) connected thru cheap Aliexpress MCIO → Oculink cables in a ToughArmor MB699VP-B V3 enclosure. All work without a problem.