Atlantis 666 wrote:Ok, so, simplifying a lot, you say: Noctua is the best for PWM factory settings that allow to spin up (or spin at least) at very low rpm, but maybe not the best for acoustic noise?
Correct, tonally there are better fans, for example the Antec True Quiet 140 tonally are much better, but this are 3pin voltage controlled fans, on PWM there is very few options, specially on 140mm. Noctua excels into their design of PWM, they design them to be able to drop very low and still have a very good range of operation. But remember tone is something subjective, there are certain frequencies that bothers some and others are fine, so all is very subjective matter.
Atlantis 666 wrote:I went on Noctua site: they tell the lower rpm they certify is 300. But according to your screenshot i could expect also a little less (250 rpm for NF-A15 PWM, 300 rpm forNF-S12A PWM)?
How i see this is that not all fans are 100% the same, so they place a range of operation that should cover any sample, some might go lower etc, but the guarantee from noctuas lowest is 300rpm, but some will drop lower, as you can see on the pictures, but dont worry to much about this, they are still inaudible at 300rpm, i would say even at 400rpms you shouldn't notice them, above 650rpms is where they start to bring their tone.
Atlantis 666 wrote:For your experience there are no fans that will allow to start spinning at 150/200 rpm? Considering instead only the the choice parameter of noise produced, which fan would you suggest?
Antec True quiet can idle at 200rpms, but this are 3pin fans not 4pin pwm, here is a screenshot of it being ran on Asus Motherboard with FanXpert2, and you cant do this with the AsRock mobo, as you need them to start a higher voltage, and then drop off, so this is why Asus can do it with FanXpert2.
But do remember that spinning at this low rpms, they barely move any air, so don't focus to much on going that low, fans below 500rpms are decently quiet, will depend a lot on your environment as well into if you will be able to notice a low rpm fan or not.
Btw the NF-A14 PWM i have running on my main desktop also spins at 225rpms on idle, this is because of the 12.5% restriction that MSI motherboard has on the bios, but on Asrock you can reach lower, weather it can be reported it will depend on the motherboard, i'll address more on this further down the post.
Atlantis 666 wrote:And last: what about the TY150 (pwm, right?) that should be the fan that should be the natural partner with HR 22 (or maybe TY141 is)? I just ask because i see it in your signature coupled with HR 22. Would it be a worst choice than Noctua in my scenario (the lowest rpm settings possible)? I ask this because on the shop i'm going to by other hardware i find TY150 at less than half price than Noctua (9€ against 21,5€), so i could give it a try. Would it spin at higher rpm than Noctua?
I find the TY150 to be a good fan, but its lowest it can spin is like 500rpm (aprox), mines spins at 540rpms at 37.5% PWM on pure bios, tonally i like it, and i cant perceive it too much even at high rpms, that said it doesn't stop ever, its like i told you before, this is a fan design that even on 0% signal it will still spin, i'll show you on a picture below. Another thing that you should account is that the HR02 was design with the TY141 in mind not the TY150, so the clips that come will match the TY141 (and Noctua NF-A15 PWM since its very similar), but for the TY150 i used other fan clisps that i had left over from my HR02, different way of mounting, so im going to suggest that you avoid the TY150 unless you are willing to invest time into mounting another way (like zipties or do your own clips, or contact therlamright for other clips). The TY141 is a good fan, and pretty cheap, but at the same time the lowest it reaches is 600rpms (even at 0% PWM), so its up to you if you find that rpms good enough compared to the 200rpms that the noctuas can give you.
Atlantis 666 wrote:1) also if you didn't try to do (your disclaimer), and also if we don't know how Noctua PWM will react to asrock bios settings, i should assume that if i will give a 10% value for power, i will obtain the result of the fan stopped with both Noctua?
In theory yes, in the practice idk. Before choosing my current main Desktop, i did a build for a friend on MSI Z77GA43 (if i recall correctly), and this was ivy bridge build, and the main reason i discover the good PWM control of MSI motherboards, but in this bios MSI did allow to reach 0% PWM, i tested multiple fans on that setup before ordering my MSI Z87-GD65, and the noctua fans did spin on the 0% settings, in most cases the RPMS were not readable, maybe was too low for the motherboard to register them, but still spin, my guess is they were below 200rpms and that was the limit for the motherboard to read. So this could happen with the AsRock as well since it allows 1% increments, and in theory allows 0%, but as i said earlier, i have never tested an Asrock motherboard to tell you for sure.
Atlantis 666 wrote:2) (considering NF-15A Fan Xpert test table in screenshot) giving about 15% power value i should be able to let the NF 15A spin up at lower than 253 rpm instead of 300 rpm that Noctua declared on it's website?
As i posted above, i believe noctua gives a range that its guarantee to work with all their production, but i believe they can spin lower, on both my MSI and ASUS motherboards i have been able to take them below 300rpms. But its easier to guarantee a range and if it doesn't drop off below that then you don't have unhappy customers that their fans didnt reach what was rated.
Atlantis 666 wrote:3) another part of the 2 screenshots says that minimum speed for the 2 fans is 179 and 209 rpm: that mean that if you were able to give 19% and 17% power value, you could let the spin at that minimal rpm (against the 300 rpm they are rated from Noctua itself)? And it would be also a start spinning rpm?
Yes and no, will depend on your motherboard, same reason i posted above that on Z77 motherboard they still spin at 0%, but on the FanXpert2 i did see them stop completely on the test, so idk for sure, specially since i don't own an AsRock mobo.
Atlantis 666 wrote:4) Why for NF 15A says minimum speed 179 rpm at 19%, but controllable range is 17%-100% and fan run when power is 17%? Maybe 19% is spin up power and 17% is spin power? I didn't understood well the meaning of the datas shown on the right of the screenshots..
Could be... im not 100% sure on this. But the % can vary slightly from sample and sample. Also remember that Asus motherboard might also bump a little bit the minimum % for not operating it on the very limit, like adding a safety margin to guarantee the fans will spin always, the test is fairly fast, its not that intensive or like multiple test, etc, so i guess they do add a safty margin, this is why most of the time you see the minimum % of operation a little lower than what they usually spin under FanXPert2, but again this is a different motherboard, so don't fully expect the same, you will have to do your own testing with AsRock.
Again if you need more info, let me know, i honestly think you are into a point where you need to test it, as i said i have very little experience with AsRock specially with their Haswell offerings, so to be sure you will have to do your own testing and establish whats good enough for you and your setup.