Sanyo claims 1500rpm/17db, which is incorrect
Incorrect..... LOL, that's pure bullshit, fresh, smelly and steaming.
For example, here are some fine and quiet fans tested recently in the SPCR anechoic chamber that can measure noises that you can barely detect.http://www.silentpcreview.com/article1266-page1.html
You wont find a fan that really emits 17Db at 1500 rpm, in reality its usually about 1100 rpm for the better 120mm fans, but even then that needs to be put into perspective. rpm vs noise is all well and good, but how much air does the fan move at those noise levels vs another fan.? Some do well as case fans and much worse as CPU fans due to the extra pressure required because of the dense stack of fins.
"Rule Number 1 of fan selection, never ever believe what the fan manufacturer says about anything except the fan dimensions, even the rpm varies from fan to fan (usually within 50-150 rpm).
Rule Number 2 of fan selection, read an SPCR review of the fans.
Rule Number 3 of fan selection, if there isn't an SPCR review, look through the forums.
Rule Number 4 of fan selection, if there is no mention of that fan create a post as you have just done."
As a general rule of thumb most 1500 rpm fans will operate correctly @ 5v (e.g. startup every time), the startup voltages are listed on the SPCR reviews, however some fans perform much worse than other when under-volted, so overall you are best off finding a fan that will push the amount of air that you want it to at a noise level that is suitable.
I didn't want to put this in the user review section because I have not done any proper tests and do not have access to proper noise equipment.
Would have been fine in there as what you have said just there is more than 99% of review on the internet will ever do, in reality it will get more exposure and comment in the fan section.
PS. Since the fan did not come with a fan tail, i crimped some 'terminals' i believe they are called (little red plastic hubs) between the fan tail/wires of an old fan and my San Ace. Is there any problems with this method with regards to fan performance? I did not use any solder.
I dont follow.
Have a look at this basic but easy to follow wiring guide.http://www.silentpcreview.com/article6-page1.html
It shows you how to get 5v, 7v and 12v, which are the only choices for "hard wiring" (e.g. fixed speed), otherwise you need a real fan controller or to connect the fan to the motherboard and controlling it via the BIOS, or Speedfan. I have a mixture in various computers.
My server has all fans fixed @ 5v, my work PC has a wrong way facing front case fan in a Sonata MK1, but that's because the side panel never gets put on, with the CPU fan controlled via the BIOS (also by far the loudest PC because of this), and my main PC has the case fans fixed @ 5v the CPU fan controlled via Speedfan and the 2 fans on the graphics card controlled by the graphics card BIOS - there is no reason to not mix and match, and likewise mixing and matching different types of fan is also perfectly OK.
The only warning to give is to make sure you dont cause any "short-circuits" and dont re-wire molex connectors coming from the PSU because if you plug anything else in further down the chain you will be passing the wrong voltages down the wrong lines. The easiest way to get 5v or 7v 3-ping connectors is to buy them ready made. some examples below.
Here are a load of pre-made models that you just plug in, the cheapest option for 1-2 fans @ 5v is the "Akasa AK-CB001" model selling for £2, it has 2x hard wired 5v connectors and 2x hard wired 12v connectors.http://www.overclockers.co.uk/search_re ... lex%203pin
Also available from dozens of places via eBay - just make sure that the fan you are planning on under-volting is perfectly happy to start at the voltage you want it to.