Short recommendation: This is probably the best fan on the market right now (as of 2021-09). Be sure to measure the available space in your chassis (or beside your radiator) to ensure the extra depth of a 30 mm thick fan won't be an issue, and buy this fan if it will fit. Unless noise levels are absolutely critical for your work, nothing else seems to beat the T30-120's versatility at the moment, and the fan would likely do well regardless of whether you need better performance (at higher noise) or better acoustics (lower volume) with still decent performance. Review: The T30-120 is a 120x120x30 mm fan, which is 5 mm thicker than your average 120 mm fan (at 120x120x25 mm). This extra depth in the frame naturally allows it to have wider blades which can generally be expected to push air more efficiently. This fan's blades and frame are all made of a liquid-crystal polymer (LCP) material, providing more rigidity compared to standard plastic materials used in fans (and thus stricter tolerances between blade and frame due to less concern over blade flexion at high rotational speeds) and overall a more durable fan, assuming the motor and bearings are also well constructed. Before discussing anything else, the main issue users may run into with the T30-120 is the non-standard 30 mm depth that limits the fan's ability to fit in more space-restricted mounting positions on a chassis (perhaps highly limiting in small-form-factor systems), but it wasn't an issue for me below the PSU shroud of the Fractal Define R6 chassis, aside from having to slightly push the PSU cables upwards a bit further. The T30-120 also seem to fit without issue in the intake and exhaust positions of this chassis. I believe most mid-tower and full-tower chassis would be able to fit the T30-120, but if you're unsure about a tight fit, it may be best to measure the clearance around the fan mounting position (perhaps with a spare 25 mm thick fan installed to see whether an extra 5 mm would cause problems) before you purchase the T30-120 sight unseen. For a brief history on LCP fans, Noctua introduced the A12x25 with highly swept LCP blades (possibly inspired by the older, but still highly-regarded Nidec Gentle Typhoon) in 2018, and the A12x25 quickly became Noctua's premier general-purpose fan. Reviewers with quantitative testing equipment found the fan to be superior to their less LCP-containing competitors in most situations, assuming the relatively high price wasn't an issue. No other manufacturers seemed interested in making competing LCP fans until Thermaltake released 120 mm LCP fans at the end of 2020, with 140 mm versions coming shortly after. Thermaltake's cheaper but similarly performing Toughfan 12 was essentially just an A12x25 with slightly different aesthetics (and possibly weaker quality control), but the Toughfan 14 brought something new to the market because Noctua had not made a 140 mm variant of their LCP fans yet. Earlier this year I purchased the Toughfan 14 (to replace some Noctua fans in my system) and found them to be decent chassis fans because they provided a somewhat scaled-up version of the A12x25's already industry-leading performance. There was the obvious trade-off of higher noise for higher performance that comes with larger diameter fans rotating at roughly the same speed, but the Toughfan 14 seemed like a good option given the increased peak performance and slightly lower price. However, after trying the T30-120, there seems to be no reason to recommend the Toughfan 14 in any situation where the T30-120 would fit. The T30-120 running at 3000 RPM seems to do better pulling air through high resistance (the restrictive bottom dust filter on the Define R6) than the Toughfan 14 running at its maximum 2000 RPM. At 3000 RPM, the noise of the T30-120 is still comparable to the Toughfan 14 at 2000 RPM, so the T30-120 is providing superior performance at similar noise volume for my use case. (Of course, both the Toughfan 14 and T30-120 can outperform the A12x25 if disregarding noise output.) The T30-120 supports three modes of operation as mentioned in the specifications: a low power 1200 RPM mode, a standard 2000 RPM mode, and a high-performance 3000 RPM mode. Only the 1200 RPM mode is specified to have an idle-stop feature below 50% PWM signal, but I've found the fans in my three-pack to stop at 3% PWM signal or lower in both the 2000 RPM and 3000 RPM modes for semi-passive cooling controllable entirely by PWM fan curves in any of the three operation modes. My T30-120 fans spin at around 280 RPM before they stop at 3% PWM signal, so going off official specifications alone, they appear to have a wider range of operation in the 3000 RPM mode than Noctua's industrialPPC line (which have a stated minimum speed of 750 RPM for the 3000 RPM version). While I don't know whether this feature is intentional, having strong fans that can stop at idle makes the T30-120 outclass the A12x25 for me. (The Toughfan 14, despite already being outclassed in performance by the T30-120 at 3000 RPM as mentioned above, is also unable to completely stop at a low PWM signal so this is another area where it's losing out compared to the A12x25 and T30-120.) But speed is not the only consideration for most people looking into new fans for their system, and there are differences between the noise of the T30-120 and the A12x25 outside of the obvious volume differences from spinning at higher speeds. The T30-120 exhibits more of a hum than the A12x25 at most rotational speeds, though audibility depends on the noise floor in the environment and each user's hearing ability. (For me, this hum starts to become noticeable above 1200 RPM.) It's unclear whether this is a result of the magnetic levitation bearing or the blade and frame geometry, but it's immediately apparent on comparison and may be an issue for people that prefer the A12x25's noise profile (more of a broadband blowing wind sound than a hum). This hum also creates an audible beat when running fans close together at the same PWM signal, with the beat most noticeable at just under maximum speed around 80-95% PWM signal (about 2400-2800 RPM). (To be fair, running any set of identical fans in close proximity would likely create an audible beat, but the beat produced by two T30-120 fans sounds like it has significantly greater peaks and troughs compared to three A12x25 running on the front intake.) I personally find the T30-120 to have an acceptable noise quality (though not as pleasant compared to the A12x25), but if near-silent or perceptually inconspicuous operation is required from your system, you would likely be better off using the A12x25 and accepting the reduction in maximum performance. (Both 120 mm fans create higher pitched noise than the Toughfan 14 due to the diameter differences, but the Toughfan 14 is louder at any given RPM. For further comparison, the Toughfan 14 is still quieter and more pleasant sounding than Noctua's current non-LCP 140 mm fans at identical RPM, so the extra stability of LCP blades likely has a noticeable impact on fan noise.) While the T30-120's longevity is not known yet (having been released just over a month ago, and excluding an anecdote at the end of this review), this fan seems like the clear top choice for anybody looking for a high-performing LCP fan. The price is competitive with Noctua's and Thermaltake's offerings and the T30-120 can serve more versatile roles with its three modes of operation. Excluding situations where the non-standard 30 mm thickness simply won't fit, the only situations where I'd see Noctua or Thermaltake winning out would be if you really need Noctua's noise profile, or if you have mounting holes that fit 140 mm fans but not 120 mm fans. (One other area where Noctua still has an advantage over competitors is in the included accessories with each fan. Noctua includes rubber anti-vibration mounts, splitters, and extension cables with all their fans, along with
