{ "numMessagesInTopic": 1, "nextInTime": 690, "senderId": "ExZy_b93iCHi16GRb4TmR12QyvW2ADKuRPOdv5bOTea1527amWjt9HNzTVhpX80Np0bQNSN3NcvPsYvM", "systemMessage": false, "subject": "Re: [IBM_T2X_LCD] Water cooling", "from": "b t <b3nwa@...>", "authorName": "b t", "msgSnippet": "Hi Andrew, No worries. What I know about this has been learned rather haphazardly and without a lot of research. But maybe it will provide some insight to", "msgId": 689, "profile": "brian_e_topping", "topicId": 689, "spamInfo": { "reason": "12", "isSpam": false }, "replyTo": "LIST", "userId": 56710949, "messageBody": "
>__________________________________
\n> Hi Brian,
\n>
\n> Sorry to bother you. I'm Fluppeteer from the T221
\n> Yahoo group. I
\n> was wondering if I could seek your advice as a water
\n> cooling
\n> afficionado... Sorry this is a bit long, but I'll be
\n> very grateful
\n> for any advice.
\n>
\n> I've just switched motherboard (from an HDAMB to a
\n> K8WE) in
\n> order to get PCI-e slots to run my T221 at 48Hz.
\n> It's got
\n> two Opteron 248s in it (I used to have a single
\n> 240), and the
\n> card doing the business is a 6800GTo (effectively a
\n> Quadro 3400).
\n> I'm about to stick a 6600GT in as well.
\n>
\n> My case has 11 fans, counting the PSU, of various
\n> sizes in it at
\n> the moment, all temperature sensitive. There are
\n> three 80mm
\n> fans sucking air onto the motherboard, and a 60mm
\n> fan blowing
\n> air away from it, plus a lot of vents; the rest of
\n> the fans are
\n> higher in the case.
\n>
\n> My HDAMB always ran comfortably, but now my 6800
\n> thinks its
\n> ambient temperature at idle is 65 degrees C, rising
\n> to 75
\n> when I got scared as I ran a demo; the GPU idles at
\n> 85 degrees
\n> and tops 105 before I wimped out. This can't be good
\n> for the
\n> contents of the case, and the temperature sensitive
\n> fans -
\n> in spite of a lot of acoustic cladding - sound like
\n> a jet
\n> engine.
\n>
\n> Since it's hard to get much more air blowing through
\n> there
\n> than there already is (I *am* adding some PCI slot
\n> blowers,
\n> but there's a warm hurricane blowing out of the back
\n> already)
\n> and I've not added a 6600GT for a second head yet, I
\n> would
\n> seem to be constrained to water cooling. I could get
\n> another
\n> case, but I've built a sound proof cabinet to fit
\n> this one,
\n> so I'd rather not.
\n>
\n> I know you recommended internal case coolers to me
\n> so as to
\n> avoid pipe movement - I'd go the same way, but the
\n> problem
\n> seems to be less getting the heat off the CPUs than
\n> actually
\n> getting it out of the case, so an internal radiator
\n> won't help
\n> me. I've gone with a Zalman Reserator (although I
\n> might need
\n> two eventually, or at least point an external fan at
\n> it) for
\n> quietness and cheapness - I found one other part
\n> with an alarm
\n> and meter on it, but since it uses thin piping and a
\n> single
\n> 80mm fan to do the cooling there's no way it's got
\n> the capacity.
\n>
\n> I know my north bridges are running hot - I was told
\n> that they
\n> ran so hot on the previous version of the board that
\n> the glue
\n> melted and they fell off, hence them being bolted on
\n> now; also
\n> my fan temperature sensors are threaded through them
\n> and they're
\n> ramping up to full speed pretty fast. However,
\n> they're situated
\n> under the card slots, and I can't find a north
\n> bridge cooler
\n> which fits under 2cm clearance (and needs to be 4cm
\n> on a side),
\n> so I think I'm out of luck with stock parts..
\n>
\n> It would also seem hard to cool a 6800 - I believe
\n> it's got a
\n> nonstandard cooler block, and I'm not sure I'd trust
\n> the Reserator
\n> to dump that much heat anyway - two CPUs (specced
\n> 89W each) and a
\n> GPU are probably pushing my luck as is. My plan is
\n> just to water
\n> cool the two Opterons and the forthcoming 6600GT
\n> and hope that the
\n> existing fans can cool the RAM, the chipsets and the
\n> 6800.
\n>
\n> I was hoping you could advise:
\n>
\n> 1) Do you know whether I'm likely to be overloading
\n> something like
\n> the Reserator (which has a relatively low rate pump)
\n> with two CPUs
\n> and a GPU? The 6600GT shouldn't get as hot as the
\n> 6800, but it'll
\n> still shift some heat. People sell water cooled
\n> PSUs, allegedly
\n> for use with the Reserator, and I presume they must
\n> dissipate
\n> more heat than this. I'd expect problems with a
\n> peltier, but I'm
\n> not quite that keen.
\n>
\n> 2) Do you think I'm right that the existing fans
\n> should cope? I
\n> don't know to what extent modern motherboards rely
\n> on the CPU
\n> fans to blast air at the components. I'd hope I'm
\n> going to get
\n> most of the heat out and the reduced overall
\n> temperature will be
\n> enough, but my knowledge of airflow design is mostly
\n> based on
\n> peering at the case and trying to imagine where the
\n> air will go...
\n>
\n> Any input would be most welcome - I'm new to all
\n> this.
\n>
\n> Thanks in advance for any help you can give,
\n>
\n> --
\n> Andrew Garrard
\n> (Please keep this email address private)
\n>
\n>
\n>
\n>
\n>
\n
\n
\n\t\t
\n