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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: pae who wrote (3300)	10/30/1998 12:24:00 PM
From: pae	Respond to of 14778

link mistake... The link I meant to post is: bxboards.pair.com regarding cooling fans on a Supermicro 750a case.

To: pae who wrote (3300)	10/30/1998 12:37:00 PM
From: Clarence Dodge	Read Replies (2) \| Respond to of 14778

pae flipping the PS fan IS doable Air pressure theories aside, the consensus of those in the know is to get the hot air out and the replacement (cool) air in. I have read detailed instructions somewhere on how to flip the ps fan. Probably on Toms BBS cooling section, though could have been Bxboards BBS. If I'm not mistaken, I think Sean also did some extensive cooling modifications to his Q500. But the ps fan blowing out seems to be the first step all recommendations make. Another good source for case/cpu cooling isssues as well as links to fan and heatsink suppliers is heatsink-guide.com Their BBS is a 300a cooling goldmine..... Clarence

To: pae who wrote (3300)	10/30/1998 2:39:00 PM
From: Dave Hanson	Read Replies (1) \| Respond to of 14778

FWIW, Paul, I don't think you need to worry about cooling given your setup. Even OC'd, the 300a celeron, manufactured on the .25 micron process, won't dissipate more than about 20 watts. Assuming you have just one or 2 5400 rpm IDE HDD's, the Q500, and no overly hot gamer's graphics card (e.g., a TNT based Viper 550), you should be more than fine. I have only the PS fan, blowing in as shipped, the small fan on the boxed 266 celeron (OC'd.) Even with 3 hard drives and several peripherals, the MB never gets over 40 deg. c-- well within acceptable range. Best guess: you'll never need to worry about it.

To: pae who wrote (3300)	10/30/1998 3:40:00 PM
From: Dirk Hente	Read Replies (1) \| Respond to of 14778

[pc-cooling] Its always a good idea to do some experiments to find out whats the most efficient way to reduce temperature in a pc housing. Because pc-enclosures varies very much in size and construction there is no simple guideline for the thermal management of a pc. Even adding a front side fan to an existing power supply fan is not always the best solution for a minimal cpu temperature (I'll come back to that later). Unfortunately, for the hobbyist there is no way other than to do some experiments. Professionals have at least the chance do some simulation, e.g. by using a software for 'computational fluid dynamics =CFD'. A very well known software for CFD is 'Flotherm' created by FLOMERICS. Well it's quite expensive 20k$ per year or so. But you may get some theoretical insight if you have a look at some of the excellent application notes from FLOMERICS: flotherm.com There is one interesting note available @ flotherm.com about the Radical redesign of a desktop PC where they demonstrate how you can optimize the temperature distribution by elimination of the front side fan (I was a bit surprised as well). At least this note shows that it's not always the best solution by simply adding a front side fan. There is another interesting note available which deals with the well discussed topic about the blowing direction of a power supply fan: in or out? Unfortunately this technical note ('Compact Modeling of Power Supplies', Technical Note #mm6.0B,@ flotherm.com is only available for FLOMERICS customers for downloading. Maybe for those who are interested you can just write to FLOMERICS and ask for a copy of it. The outcome of this note is, that the configuration where the power supply fan blows into the pc housing (directly onto the cpu) seems to be favourable wrt cpu temperature. In both cases the air enters/exits the housing through the vents (i.e. there is no 2nd fan). For my project at home, I've switched to dual Celeron 300A@464MHZ in the meantime (yeah..after going through the drilling procedure), I'm still in the preparation phase for an efficient cooling system. So far I've added just a second fan at the front side which blows into the case while the second one in the power supply unit (PSU) blows out of the housing. But I think my PSU is not according to the current standard (forgot the name) which requires that the PSU fan is faced to the CPU and not to the HD section in the pc case. Both of my Celerons have a standard cooling unit with one small fan attached to it..so nothing special. But everything runs stable for weeks now even tho I'm doing quite heavy floating point stuff for hours on my pc (remember I'm not a gamer..so I can't tell you about Quake). Anyway, I want to go even higher and I already managed to keep my system running at 504MHZ with a very big heat sink for about 4 hours. But that was not a very efficient cooling. Currently my favourite is a water cooling system. For a nice treatment of this topic I recently found an excellent design guide here: r-theta.com (Aqua sink)

To: pae who wrote (3300)	10/30/1998 7:18:00 PM
From: Spots	Read Replies (1) \| Respond to of 14778

>>P5166 Socket7: Powersupply fan only! blows in! Yikes! Yeah, yikes. Your power supply fan should blow out. The PS generates the most heat in the case, and you want it exhausted. Ok, maybe a really hot processor generates more, but I don't think so. In any case [puns always intended] you want the PS blowing out. Spots

To: pae who wrote (3300)	10/30/1998 8:15:00 PM
From: Howard R. Hansen	Read Replies (3) \| Respond to of 14778

Although on the invoice as including a 2nd fan, the only way I can get to 2 fans is to include the power supply fan. Perhaps this is normal industry counting - like counting from zero.<g> My case was advertised the same way. They counted the power supply fan as one of the fans. The second fan is mounted next to the power supply and both fans blow out. I have three 5400 RPM hard drives and did not add any additional fans. Unless you are running a couple of 20 watt 10,000 RPM hard drives you shouldn't need an additional fan.