So, initial impressions after a day or so with the SF600 Platinum:
0) It's powering a 2700X and EVGA 1070 FTW2, both at stock settings for now.
1) I have yet to see the SF600's fan kick in under typical browsing conditions, nor when quickly trying out some older games (e.g. Fallout 3 at Ultra settings). As of yet, I've only seen it turn on when running FurMark or Time Spy, which peaked at about 310W and 275W from the wall, respectively.
2) If those examples are anything to go by, I'm happy to report that I doubt I will ever hear the PSU once I put the sides on the case. In fact, until I put my ear within an inch so that I knew what to listen for, I thought it was entirely silent. Once I could hear what it sounds like (a dull, low frequency hum), I was able to notice the sound from about an arm's length away, but again, I wouldn't have even known it was there had I not specifically listened for it.
3) When starting FurMark, there's a few seconds between when the benchmark starts and when the 1070's fans spin up. During that time, the 1070 can still be heard as it audibly computes those first few frames. It's a quiet sound that I doubt most people would ever notice unless they specifically listened for it. Even with its fan spinning, the SF600 Platinum is quieter than
that.
4) Needless to say, the SF600 Platinum is
tremendously quieter than the stock Wraith Prism that I'm stuck using with the 2700X until my AIO arrives, hopefully this week or next.
5) I'm not noticing any of the clicking, whirring, or other sorts of sounds I've seen people use to describe their experiences with bad SF600 Gold units, so either I lucked out or the Platinum really is that much better.
6) Oh, and the premium sleeved cable set that it comes with is great, of course.
Anyway, based on my complete and utter inexperience with any of the alternative or competing PSUs, I'm very pleased with it so far!