And a little nudge again — try removing pci brackets to further reduce GPU noise. You may even be able to remove one set of fans after that mod
Not going to happen, I don't want it to look ghetto. I doubt that it will make any difference, Below graphics card, I have wifi card, so I probably only have one PCI cover left. It won't make any difference.
Not so sure, capacitors and fans seem to be the first thing to wear out for power supplies and one must catch a dry fan early for reoiling or the supply will overheat.
That said, I tend to recap what I have with top quality replacements and oil the fans with a lot more oil than they had originally; at that point I'd tend to agree with you.
I never seen a fan fail myself. I even have 14 year old case fan , it works. I have two cards with fans from 2004, they work. I have old AMD Athlon 64 cooler, fan still works. I only got defective fan from CM with water cooler, but after bypassing PWM pin it works fine. My dad had dead graphics cards fan on Sparkle FX 5200 twice, but it wasn't my computer and maybe it was dust build-up, which obviously he didn't clean. From my experience fans works a long time, very long time. Meanwhile the least reliable thing in computers is clearly motherboards. I have seen many failures and deaths of those things, they simply don't last. I don't know why exactly they die, but capacitors may be a suspect. But then, I haven't seen a failure of old PSU or graphics card, which also have tons of capacitors...
I believe the less blades on a propeller the more efficient.
I don't know about that, it doesn't seem correct. Right now, the best computer fans are Scythe Kaze Flex and they have 9 blades. I only seen 9800 rpm 3 blader, so maybe at those very high revs more blades is worse, but at lower revs there's no reason to think that.
Because we're talking about fans i have a question: if my fans are rated 1500rpm but i make them run at 1600rpm what could it happens to it?
Likely nothing, but if you raise their voltage too much, fans can burn.
Hm? I don't see how that's relevant. mITX is a standard. Heck, if anything, the SFF PC market is an excellent demonstration of how breaking standards leads to problems - try to google how many people have issues fitting the DTX Asus Crosshair 8 Impact into various SFF ITX cases, for example. SFF cases also tendt to be very meticulous in documenting their clearances and limitations for non- or not-quite standardized things like radiator/fan fitment (not the size or mounting patterns, but if any can fit, how large, etc.), CPU cooler clearances, GPU size, etc. As for trying to make PCs smaller, the whole point is doing so while maintaining compatibility. Look at the Dan A4 for example - the entire purpose of that case is allowing you to build a powerful PC with all standard components - ITX motherboard, dual-slot full-size GPU, SFX PSU. All accepted standards. There are plenty of proprietary SFF solutions from the likes of Zotac, but you can't build those yourself. DIY requires adherence to standards to work.
Sure, I meant that mITX may be standard, but when it comes to cooling or graphics cards, it soon becomes wild west. That stuff causes tons of clearance issues and what? People still buy mITX boards and SFF cases. I don't see why thicker fans couldn't be sold.
But you're not accepting the inherent consequences of that, in (likely much) lower sales and limited compatibility. Of PC gamers (to pick a sizeable group with high performance PCs), only a small minority DIY build their PCs. Of those, only a small minority buy additional fans beyond those that come with their case. Of those, a large portion likely just buy whatever is cheapest as they discover free fan slots and are given advice online to just stuff it full of fans. So the people doing targeted purchases of brand-name fans? That's already a very small group. Adding "use cases where a thicker fan will fit and provide tangible benefit" is likely to make the target market so small as to be near meaningless.
But somehow clearly luxury stuff like AIOs, RGB and other stuff sell. Even RTX 3090 and it doesn't make any logical sense either.
Meaning that with any significant R&D cost, these fans would become ridiculously expensive. High end 25mm fans like the NF-A12x25 are already ridiculously expensive.
That's only because Noctua overprices their ripped off Gentle Typhoons. Those fans are certainly not even worth 10 Euros. On fun note, in some tests Arctic P12 beat Noctuas in noise and performance and they sell their fans for about 5 Euros. Do you honestly think that Noctua isn't ripping off?
And BTW what RnD? Is just stretching already existing designs so expensive?
Starting from scratch with literally every single part of the fan for a >35mm fan? I wouldn't be surprised if that doubled the costs from there.
You keep talking like thicker fans don't exist. Servers, cars, fridges and other things already have thicker fans. It's certainly not a Herculean task to make 40mm fans. And I said that someone has already done that.
You clearly have a highly optimistic view of how informed and rational people's purchase decisions are. Heck, even lots of people on these forums make poorly informed purchase decisions (excluding those who come here after the fact to seek help, which is not an insignificant group). But most people don't frequent tech/PC forums. Trying to inform your way out of breaking compatibility is a fool's errand, will inevitably mostly reach the people who already understand the issue (as those are far more likely to seek out these channels of information anyhow), and ignores entirely the game of telephone that is public discourse on any topic. Things get lost or transformed in transmission, and there's no amount of marketing or clear communication that can realistically overcome this. It can make a positive impact vs. doing nothing at all, but the problem will by no means go away.
With such thinking, you won't achieve anything. That's all I can say here. You know, there wouldn't be PCs if someone hadn't broken standard.
That doesn't really make sense. The main benefit of a thicker fan is allowing for more pressure, as the thickness minimizes the effects of back-pressure resisting flow or flowing back between the blades. Also, if you look at the specs, it isn't really a pressure design - the 2200rpm 25mm Vardar is rated for 3.16mmH2O, while the 1800rpm 38mm Meltemi is rated for 2.75mmH2O.
Well I look at blade shape and they clearly look like Silencio FP's, which is pressure oriented design. BTW you said that pressure is measured while fans are completely blocked, Meltemis may not lose as much pressure as generic 7 blader at higher speed, which is what you want in radiator.
oops this is more direct 
