Search found 135 matches

by pcy
Mon Aug 17, 2009 3:17 am
Forum: Fans and Control
Topic: Is larger fan (20cm) much more quiet than smaller fan?
Replies: 3
Views: 1583

Hi, The factors to look at are Rotation Noice and Air Velocity (not CFM). CFM is Ait=r Velicity x Cross Sectional Area, and provided you have a sifficiently large Cross Sectional Area you can achieve almost any CFM while retaining low Air Velocity and hence low Noise. The bigger fan helps with both ...
by pcy
Mon Aug 17, 2009 3:11 am
Forum: CPU Cooling
Topic: Heat Pipe "Wick"
Replies: 4
Views: 1480

Hi, Thanks. That's what i was thjinking. If the pipes are extruded then all heatsinks must have the bends put in afterwards. No - I was thinking of manufacturing my own CPU coolers, and the only difficult bit appears to be the heatpipes. I'd probaly buy them in from some plant in China because I sus...
by pcy
Fri Aug 14, 2009 11:57 am
Forum: Fans and Control
Topic: Is rpm short for "rotation per MINUTE"?
Replies: 8
Views: 2248

Hi, No - its revolutions perminute. A revolution is an angular movement, or rotation, of 360 degrees. A rotation is an unquantified angular movment. If the fan stopped and started, and you called each angualr movement (from start to stop) a rotation, then "rotations per minute minute" would be the n...
by pcy
Fri Aug 14, 2009 6:59 am
Forum: CPU Cooling
Topic: Heat Pipe "Wick"
Replies: 4
Views: 1480

Hi, Ok... put it another way, are the bends put in by teh Cooler manufactures made in any special way to prevent damage, or can we reasonably assume that any bends of teh same sort of radius can easily be made. Why would sintered metal, or just plain grooves be more brittle than ordinary metal? How ...
by pcy
Fri Aug 14, 2009 6:53 am
Forum: Cases and Damping
Topic: Is the case the noisy component?
Replies: 11
Views: 2268

Hi, 7C above ambient isn't bad at all - if you try for anything under 5C the fan noise will be horrendous. But braodly, the idea does not work. You need the fans even if there is no case at all. The PC components heat up the air they are in contactt with; and if you have no fans, convection current ...
by pcy
Fri Aug 14, 2009 4:03 am
Forum: CPU Cooling
Topic: Heat Pipe "Wick"
Replies: 4
Views: 1480

Heat Pipe "Wick"

Hi, I understand broadly how a Heat Pipe works, but If anybody knows in more detail: Two Questions: 1. What is thi structure of the "Wick" on the internal wall of the pipe. I assume it's just a collection of grooves crated when the pipe is extruded to help return the the fuid in its liquid state to ...
by pcy
Fri Aug 14, 2009 12:31 am
Forum: CPU Cooling
Topic: Quiet Xeon Cooler
Replies: 6
Views: 2302

Hi, As shown here http://noctua.at/main.php?show=productview&products_id=19&lng=en , they do fit. The design is modified so air goes through both coolers, the airflow is bottom-to-top. Both coolers are rotated to make it possible. The model from that link is for Socket 771 Xeons. That's interesting....
by pcy
Thu Aug 13, 2009 3:57 pm
Forum: CPU Cooling
Topic: Quiet Xeon Cooler
Replies: 6
Views: 2302

Hi,


Nice Coolers.


Shame they don't fit.



Peter
by pcy
Wed Aug 12, 2009 9:02 am
Forum: CPU Cooling
Topic: Quiet Xeon Cooler
Replies: 6
Views: 2302

Quiet Xeon Cooler

Hi, I'm looking for a quiet cooling solution for Xeon's. There does not seem to be one. First, though I agree it's a niche subject, I was hoping to find a section on socket 771 coolers in "Recommended Heatsinks" Secondly, I'm interested to know if other people think this is something that should exi...
by pcy
Mon Aug 10, 2009 1:21 pm
Forum: Cases and Damping
Topic: Good airflow or "soundproof" case ?
Replies: 18
Views: 4914

Hi, Putting the fans in the middle is (IMO) the right thing acoustically, but it does increase the length... I do plan an shorter version with 2 x 140mm fans close to the front, and that would be well over 5 cm shorter. The front door opens along either of the long edges - the top (in RackMount/Desk...
by pcy
Mon Aug 10, 2009 12:24 pm
Forum: Cases and Damping
Topic: Good airflow or "soundproof" case ?
Replies: 18
Views: 4914

Hi, The airflow is in no way impeded by putting the fans in the middle. In fact it's the only place in a case where you can get three fans running in parallel. I take your comments on the website - it's due for a major re-vamp when the two new cases (a replacement for the 4U, and a 5U version) are r...
by pcy
Mon Aug 10, 2009 10:31 am
Forum: Cases and Damping
Topic: Is sound damping very useful to reduce noise (Sileo 500)?
Replies: 4
Views: 2430

Hi, I'd say that damping material is not particulalrly important/effective but it all depands what point you are starting from. If the case rattles or vibration from any of the PC components can reach the main case shell, then you have to stop that from happening, and damping material can paly a rol...
by pcy
Mon Aug 10, 2009 10:16 am
Forum: Cases and Damping
Topic: Good airflow or "soundproof" case ?
Replies: 18
Views: 4914

Hi, I'm struggling to see any noise (reduction) oriented features in the CM Sileo 500. Follow my sig if you want to see a case design that actully does reduce noise. But to answer your question directly, the best route to low noise if to use as many/large fans as possible in a low air resitance case...
by pcy
Tue Aug 04, 2009 2:17 am
Forum: CPU Cooling
Topic: Xigmatek Achilles
Replies: 6
Views: 1706

Hi, It's a good cooler, but the S1283 will be better on a Q9550. The Achilles is a Xigmatek S1284 with a pretty fan and a chrome finish. The "4" in 1284 stands for 4 (double) heapipes. The Q9550 is a relatively small CPU and you don't get good thermal contact to all four pipes in consequence. The S1...
by pcy
Sun Aug 02, 2009 2:39 am
Forum: SPCR Article Discussion
Topic: Intel LGA775 Low Profile Heatsink Roundup
Replies: 38
Views: 19639

Hi, Two more coolers to consider: 1. Nexus LOW 7000 ... Peter I just built a living-room PC using a Nexus LOW-7000, ten days ago. In a Lian-Li PC-C37B ... A few trivial observations about the Nexus LOW-7000: ... B.) It does fit in this case, but only just. The heads of the little plastic pop-rivets...
by pcy
Fri Jul 31, 2009 12:14 pm
Forum: Power Supplies
Topic: Is PSU fan speed controlled by temperature only?
Replies: 10
Views: 6010

Hi, Temperature is used to control PSU fan speeds because it is cheap and reliable. The temperature used is one that is typically high compared to the coolant air temperature, with the effect that the fan speed is more related to PSU load (which is reponsible for the heat) than to ambient temperatur...
by pcy
Sun Jul 26, 2009 1:04 am
Forum: SPCR Article Discussion
Topic: Intel LGA775 Low Profile Heatsink Roundup
Replies: 38
Views: 19639

Hi, Two more coolers to consider: 1. Nexus LOW 7000 At 70mm high (including fan) it is taller than the coolers in the review, but only by a few mm. Compared to the Shuriken, it has a similar design and a slightly larger fan, plus a much more sensible mounting system - should make an interesting comp...
by pcy
Fri Jul 24, 2009 11:23 am
Forum: Fans and Control
Topic: How to keep fan normally off?
Replies: 17
Views: 3777

Hi,


You could try putting a Zenner Diode in series with the fan to reduce its voltage by a fixed amount.



Peter
by pcy
Sun Jun 28, 2009 11:18 am
Forum: Cases and Damping
Topic: Antec HDD 'O-rings' - Any other cases which contain these?
Replies: 7
Views: 2009

Hi, The latest verision of the PaQ case certainly uses a rubber suspension sytem for the HDs. It's hard to tell from the animation and diagrams on the Antec site, exactly how their system works. The PaQ system is to provide a pair of O-rings running parallel to eachother and about 6" apart for each ...
by pcy
Sun Jun 28, 2009 11:00 am
Forum: Cases and Damping
Topic: VECT: Scratchbuild cool, quiet case.
Replies: 5
Views: 1971

Hi, That will work fine... I know because it's basically the same design of the PaQ (Powerful and Quiet) case which I've been quietly selling for a couple of years in small volume while I get the manufacturing processes to work properly. http://www.paqt.co.uk/documents.html The documentation is way ...
by pcy
Thu May 14, 2009 1:11 am
Forum: CPU Cooling
Topic: Computer open on desk, need CPU cooling advice thanks
Replies: 2
Views: 955

Hi, It would really help if ypou told us which Xilence model CPU cooler you bought: the 80mm fan is certainly a problem, but th ecooler itself may not be up to the job. There are no coolers with heatpies and 80mm fans on the Xilence site. Also, knowing your actual CPU would help - or at least the ap...
by pcy
Wed May 13, 2009 5:02 am
Forum: Fans and Control
Topic: Alternate dual exhaust case fan idea for better silencing
Replies: 6
Views: 2381

Hi, I can't comment on other cases, but in the PaQ case the air filter has no measustrable effect on airflow. The PaQ air filter is placed immediately in front of the main muffler, just inside teh front door, so you can easily access it to clean it. It is 168mm x 168mm (233mm in the new bigger case)...
by pcy
Sat Apr 25, 2009 8:30 am
Forum: Fans and Control
Topic: Slow down PWM fan at hardware (cable) level
Replies: 12
Views: 5224

Hi,

I'm quite certain that if you simply reduced the voltage on the nominal 12v supply to a PWM fan by adding a resistor it would slow down.

I also suspect that the slow down would be in the same proportion at all fan speeds.


Peter
by pcy
Tue Apr 07, 2009 8:32 am
Forum: Cases and Damping
Topic: Best Silent Case Out Of The Box?
Replies: 14
Views: 3809

Hi, ... the best case that has low noise levels straight out of the box? Since you live in the UK ther really is only one answer: PaQ haha, not at those prices mate! unless you got a spare £250 to borrow me? :D You asked the question, unqualified, so I answered it. The headline price of £253 inclu...
by pcy
Mon Apr 06, 2009 2:42 pm
Forum: Cases and Damping
Topic: Best Silent Case Out Of The Box?
Replies: 14
Views: 3809

Hi,


Since you live in the UK ther really is only one answer:

PaQ



Peter
by pcy
Sun Apr 05, 2009 1:28 am
Forum: Fans and Control
Topic: How much CFM do I need for my case fan?
Replies: 9
Views: 15728

Hi, 30 CFM is a good working figure... Q = (1.76 * H) / T where Q is airflow in cfm, H is Heat dissipated in Watts & T is Temperature rise in Centigrade. Note headline fan airflow specs are in free air (no back pressure) - in reality your config has back pressure. To cause an argument assume your fa...
by pcy
Tue Mar 31, 2009 1:16 am
Forum: CPUs and Motherboards
Topic: Core2 or i7[?]
Replies: 13
Views: 3681

Hi, I don't see the point of a Core i7 right now unless you're doing some extremely high end computing tasks. None of that seems to apply to your situation. A Core 2 Duo/Quad is generally lower power and easier to keep silent and there's a much greater variety of available motherboards and coolers. ...
by pcy
Sun Mar 22, 2009 2:09 pm
Forum: Fans and Control
Topic: 180mm fans -- Where to get them?
Replies: 5
Views: 2594

Hi, http://www.newegg.com/Product/Product.aspx?Item=N82E16835234004 Xclio 180mm fans. Flashy lights and rediculously overpriced, of course, but they are there if yoiu want them. Now, if anybody can tell me who actually makes them for Xclio... because if I could get them made in more robust material ...
by pcy
Fri Mar 13, 2009 4:47 am
Forum: Cases and Damping
Topic: CM Cosmos HDD Suspension Tutorial
Replies: 8
Views: 6227

Hi, We have just redisgned the HD cage in the PaQ cases to do something similar. We use rubber O-rings which are very robust (lots of cars suspend their exhausts on thicker versions). Each HD is suspened on two O-rings, each strung across one end of the HD cage. This is acheved with two pieces of pl...
by pcy
Sat Feb 28, 2009 5:39 am
Forum: Fans and Control
Topic: cooler master or yate loon
Replies: 16
Views: 3227

Hi Neil, There are also differences in the shape and angles of the blades of the Yate Loon branded models, and the Nexus. And there may be differences in the angle the struts are in relation to the trailing edges of the blades.... I find that extremely interesting, and a bit surprising. The actual c...