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This might be too late for a reply, but to answer the general question of SFX vs ATX: To paint broad strokes, SFX & ATX today can overlap on quality & watts with two exceptions: 1) ultra-short millisecond-type GPU spikes / transients beyond the rating (due to smaller capacitors on SFX models) and 2) availability of 850W+ SFX PSUs. SFX are still quite a bit pricier & rarer (e.g., availability, region), though. Still, 650W from an SFX PSU = 650W from an ATX PSU, all other things equal. To actually compare SFX vs ATX: it'd have to be a model vs model comparison, as the overlap goes both ways: good SFX beats bad ATX, but good ATX beats bad SFX. The PSU's test results matter more than the form factor, which is an improvement from the earliest SFX days.

I think that's due to 80+ ratings being minimums. So PSUs even just below Platinum still are rated Gold. The Corsair RM850X actually is Platinum-level efficient at 20% load / 170W (Platinum minimum: 90%; achieved: 90.5%), but it's just a bit short for 50% load / 425W (Platinum minimum: 92%; achieved: 91%) and 100% load / 850W (Platinum minimum: 89%; achieved: 86%). For those PSUs, according to the 115V efficiency charts by SeaSonic and Corsair: Seasonic SSR-550 (80+ Gold): This PSU is ~90% efficient at 250 watts. Corsair RM850x (80+ Gold): This PSU is ~91.5% efficient at 250 watts. 1.5% loss @ ~250W is 3.75 watts additional loss, which looks close to your data.

Thank you for sharing this. I noticed this video & the Unraid guide ask us to put Time Machine on one drive only. Is this something that might become more flexible in the future so that we could allow larger macOS backups to be spread onto more drives? Or it’s a more technical limitation why TM backups are one-drive-only?