But the less rpm the less air flow which is translated in bigger unwanted temperatures. So rpms is the first principle of a noiseless fan. So what if someone reduced the rpms but made bigger the diameter of the impeller? You could have almost same or better results if for example rotate a fan of 120mm with 1500 rpms compared with a fan rotated at 3000 rpms with 92mm diameter. I wrote 2 paragraphs above about the principles of the fans.The shape, the angle the quantity of the impellers of a fan, the rpms and the anti vibration fix system make those european fans to be leader fans against the fight with noise. Those fans although most of times are made in China (but it is not the rule, because there are some exceptions) they are designed and developed from European mechanics. Arctic from Switzerland, Noctua from Austria, LC Power from Germany, Black Noise from Germany etc. Although computing started from USA and the hardware parts since a lot of years are made in China, the noiseless fans for home computing comes from brands from Europe e.g.But as i wrote above, NMB, SANYO DENKI & Delta are not what we call “Home computing fan manufacturers”. But ball bearings although are the most reliable, they are a standard choice of car manufacturers but it shouldn’t be a standard choice for home computing fan manufacturers. And if you want to make the fan almost unbreakable then you use a ball bearing. The principle of fan is that the more rpms, the better flow of air and the most noise.These fan manufacturers, although are huge brands with million sales per year, they not focus on home computing, but on production of fans for every possible reason that will be super reliable for heavy industrial use and that will have huge air flow according their diameter, comparing with fans with the same diameter from other “home made” brands. Dell sign contracts with NMB, Delta and Sanyo Denki as suppliers of their precision 490-690 machines.That memory fan try to break your nervous system. But on the other hand you are at your home’s armchair and you want to take a break watching on e.g. Those machines work inside noisy environments with a lot of colleagues talking one to each other and a lot of ambient noise inside atelier, industries, warehouses etc. But a workstation is a machine which usually not a lot people have inside their homes. Dell produced the workstations to work 24/7/365 and this is undoubtedly the reason which the precisions’ 490-790 mobo are still working without broken capacitors and destroyed north bridges.It was not very hard to understand after some tests i did (no reason to write details about the tests) that the main noisy performer was the memory fan.Then put your cell phone as near as your sitting position (at the same level with your ears) at the time you work with your precision 490 -690 and read how many db your application writes on the screen. There are tones of such kind of applications, but stuck with one application maybe two, just to verify that the first one was reliable.
#Dell precision 490 heatsink android#
I started my measurements of the db produced by my 490, by downloading an application on my android phone.I had to make the noise to go from 55-60 db to reasonable 25-28 db and if i could manage something better then it will be something even more very welcome.My final thoughts, tests, comprehensive of a fan, market research and decision: I just explain you why the water cooling solution abandoned after 3 days of research and i started thinking an alternative solution.So no solution for the cooling of those DIMMS even if you go for a water cooling expensive project. Even if you go with a new power supply and a patented DIY water cool module for 771, then what are you gonna do with those tricky FB - DIMM EEC MEMORY MODULES which transmits huge thermal loads inside the case? Those DIMMS are really very hot at the working time and make the case become a hot pan.This means more money than the money you spend for your 490-690.
I mean that if you really want to eliminate the noise you have to buy a new power supply without fan. Even if you manage to fit a custom kit there is another problem: You can not deal with the fan of the power supply and the fan of the memory.
So you must do some custom patents to adapt the water cooling pump on the 771 sockets.