venturias for comparative performance, apples to apples, exact build to exact build, the T30s provide about 2C better cooling for Xeons at same RPM range.

DrediBut at same noise range, they lose. According to the TPU review measurements anyway.

ValantarI'm not looking at noise normalized results, I'm looking at airflow and noise results at fixed fan speeds. At 1000rpm, the T30 is listed at 26CFM vs. 24.2CFM for the NF-A12x25 (I mistakenly looked at the airflow number for the NF-F12 in my previous post, but the difference isn't that huge), while the noise measurements at that speed are 30.6dBA vs. 29.1dBA. Now, this doesn't tell us anything at all about the sound signature, which is very significant, but those numbers still show that the T30 delivers noticeably more airflow at the same speed for an unnoticeable increase in noise. It's not a massive difference, but it's clearly there. As for your graph, that's a rather problematic presentation as it relies on unaligned data points that don't correspond with any of the axes - if I didn't know those data points were based on RPM, it would look like you had picked four entirely random measurement points. For a full comparison, we clearly need more data points - 100rpm intervals, for example. But it's still safe to say that the T30 delivers more airflow at 1000rpm for slightly (and not likely to be noticeably) more noise, while the NF-A12x25 still clearly wins out below 1000rpm. IMO, either fan will likely be fantastic - and I completely agree with @Chrispy_'s summary above. There are several good options out there.

venturiat same RPM, they seem just as quiet, bare in mind I've never needed to run the T30s at their max 3000 RPM (then again the Noctuas do not have a 500-3000 rpm range) so maybe at 2000RPM the noctuas may be quieter. But - at the 500-1300 rpm range the T30s seem just as quiet and give about 2C better cooling. Yes, 2C isn't much and for many its not worth the effort, but for me it was.

ValantarA liquid crystal polymer will never have a perfectly uniform color, so ... meh.

ValantarAlso, I'd be pretty surprised if that paint layer is thin enough to not affect airflow and noise at all while also being durable enough to stay on for the useful lifetime of the fan. You're also pretty lucky if the paint didn't unbalance the rotor or increase the weight sufficiently to cause long-term wear. It's possible to avoid all of this, but it takes some luck and some skill, and definitely isn't feasible at scale.

OberonI'm not even talking about that, I'm talking about how the covered up the bearing center with that ugly pimple. The contrast is nice and the little bit of brass in the middle is a nice touch.

OberonObviously Noctua wouldn't be spray painting their fans at scale, but a coating a few tens of microns thick like you get when spray painting isn't going to cause any issues with noise or vibration. This is like the FUD spread by the Noctua fanatics that claimed the tip clearance was too small and that the fan wouldn't spin after painting. I've been running these fans continuously for 1.5 years at this point with no issues, and that includes a 5 V version that I've run all the way up until the blades start scraping the frame at almost 3000 RPM (which it also did before it was painted, I might add.)

TurmaniaWe dont know the longetivity of T30's as of yet. Pretty new. Horizontal or vertical? All those sorts.

ValantarThat's only true if you're either very lucky or impeccably skilled (or some mixture of the two) at spray painting. Paint is notoriously uneven, and most off-the-shelf spray paint nozzles does not lend itself to even coatings a few tens of microns thick. You can get it thin, but thin + even coverage is pretty hard, plus drips, blobs, accumulations in contours (such as where the blade meets the hub) is par for the course. Paint adhesion to plastic is also very hit or miss, depending on all kinds of factors (the paint, the plastic, its cleanliness (both from dust, touching and any oils and residues left from manufacturing), so ... you might have gotten it to work, but that doesn't mean it's generally a good idea.

OberonWell, I've done 13 NF-A12s at this point (not to mention the dozens of other fans throughout my time in the hobby) and they've all been fine, so I must be the luckiest person alive! :D

TheDeeGeeI wonder if the new 140 Fans will take 5 years to come out in black now that they figured out the formula.

Chrispy_Yes we do, it's the SUNON maglev bearing that has been used in industrial/datacenter fans for years. They're the best in the industry and patented so you won't find (legal) imitations.
6 year warranty and 150,000 MTBF which matches Noctua's warranty and MTBF but unlike the SUNON bearings, there are far fewer Noctua fans used in servers, datacenters, and non-PC appliances.

I'd put faith in both to massively outlast their warranty period but if I had to pick a winner I'd take SUNON's maglev bearings over Noctua's tried-and-tested fluid dynamic bearings. Noctua's SSO2 bearing has a proven track record, but they're prone to rapid death when they do eventually start to dry out. Maglevs just seem to last forever (I've yet to ever encounter a dead one).

DeeJay1001I recently tore apart a very old dell power edge server that had a pair of 120mmx38mm Sunon Maglev fans. This server ran 24/7 for almost 15 years running a now antique shipping label service. As far as I know the fans were original and still moved mountains of air, no play in the bearings and no signs of stopping. I've seen delta and nidec fans do equally impressive things but there is no doubt maglev fans have proven to be one of the best.

Chrispy_Thanks, I rest my case. Sunon Maglev fans are absolutely bombproof.
Most Delta/Sunon/Sanyo fans are.

People forget that consumer PC fans are unbelievably cheap and nasty things compared to enterprise grade hardware that has to run for a decade in a datacenter at 3000-7000rpm without requiring replacement. By server/enterprise standards, these Phanteks T30 fans are an absolute bargain. €50-130 per fan is what a quality unit will cost for rackmount hardware.

Chrispy_AThanks, I don't think I've ever encountered a server in use for that long, but unsurprising to hear about the fans; Sunon Maglev fans are absolutely bombproof - most Delta/Nidec/Sunon/Sanyo fans are because they're not intended for the cost-sensitive consumer market, but aimed at the reliability-sensitive industrial market.

Sanyo powers the cooling fan in my 2004 electric oven, and Sunon powers the hefty 235mm primary air-source heat exchanger fan running 24/7 in my apartment for the last 11 years.

People forget that consumer PC fans are unbelievably cheap and nasty things compared to enterprise grade hardware. By server/enterprise standards, these Phanteks T30 fans are an absolute bargain. €50-130 per fan is what a quality unit will cost for rackmount hardware.

DeeJay1001While it is true most consumer fans are built to a lower standard completely writing them off isn't fair. Decent but still cheap fans such as the Arctic P12 or Fractal X2 GP-12 will easily last the lifetime of the typical build. I use P12s or the fractals in most of my lower to midrange builds and they are never an issue. Still, my favorite high end fan is the Gentle typhoon 2150, now you can get them easily under the name XPG Vento Pro.

I haven't tried one of the new T30s but they look top notch, however $10 more per fan over a XPG Vento Pro is a tough sell for me.

ValantarRe there any industrial/commercial fans using sleeve/rifle/similar bearings, or are they all either ball bearing or maglev? Noctua's strength does seem to lie at least partly in very good silent bearings that last long and handle decent speeds (at least 3000rpm) - but I wouldn't expect them to handle server grade speeds at all. Ball bearings will always sound grindy at low speeds, but maglev does seem to promise the best of both worlds. Corsair's ML series failed to deliver on that promise (definitely not quiet!), but if the T30 is maglev I guess that makes it the first truly successful consumer implementation.