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Cooling Bad watercooling preformance

Discussion in 'Hardware' started by Fr4nk, 28 Feb 2007.

  1. Fr4nk

    Fr4nk Tyrannosaurus Alan !

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    Right then I finally got my Aqua Computer loop intstalled, well pretty much, the 360 BIP is being mount on the bottom of my 830- currently there is not hole in the bottom but the rad is mounted about 8mm above the case floor, now obviously that's not perfect but I'll be cutting the hole sometime next week. Now for the rest of my loop;

    Fass - Aquastream(pump) - Cuplex XT(cpu) - Aquagrfix1900(full coverage block) - BIP 360(with 3 ~1200rpm fans) - Fass.

    X1900 XT temps are relatively low - 38 idle 45 load cpu is pretty decent on stock speeds voltage; 32c idle and 38c load BUT when you start adding juice, 1.55-1.6v Vcore. Temps increase rather a lot, 43-45 idle 49 load (this is still on the stock speed, 2ghz!) then if you increase the cpu speed; running on 2.4ghz the idle temps creep up to 48c and 55load (If I run the cpu any faster it hits 61c and auto shuts down...

    Surely the I should be getting better temps than this ? I've got some high grade wet and dry on order so I'm going to lap the block and see if that helps but has anyone got any ideas ? I debating whether another rad may help, a 2x120 one in the front bays maybe...


    -Fr4nk
     
  2. airchie

    airchie What's a Dremel?

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    a 360 rad should be better than that.
    How's the rest of your cooling in the case?

    I'd say take the side panel off your case and run your rad in the fresh air and test again... :)
     
  3. teamtd11

    teamtd11 *Custom User Title*

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    A 360 rad should be well enougth, im running a x2 4200 and a x1900 on a single rad, and i get brilliant temps, get the case cut up befour looking into another rad. but there should be no need at all IMO
     
  4. r4tch3t

    r4tch3t hmmmm....

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    This would most likely be the problem, you wont be getting much airflow with so little clearance. Especially with low speed fans.
     
  5. Krikkit

    Krikkit All glory to the hypnotoad! Super Moderator

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    Are you sure you're getting good contact with the block? I had the same problem with my Swiftech, it uses high-pressure mounts, and I hadn't tightened them up enough (the classic "that pressure doesn't feel right to me, it'll break" situation).

    Do the tubes feel warm?

    If they do, your rad is the problem, as it could be getting poor airflow, but 8mm from the bottom, with a good fan setup, I'd expect it to be pretty decent, as 8mm is usually plenty imho.

    Are you sure there's no air still in there? Big bubble stuck in your CPU block? Restricted flow?
     
  6. Fr4nk

    Fr4nk Tyrannosaurus Alan !

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    Bah! I complete forgot I made this thread, must get some more sleep.

    As said I'll be cutting the hole for the rad either this weekend or next weekend, as well as lapping the block. I've remounted it 3 times, gave the block and the cpu a polish that got the temps a few degrees down but the tubing does feel pretty warm as well as the Fass especially on load. looks like the rad (well it's lack of airflow) is the problem, well I'll sort that out soon :) Oh and the side panel is off, I'd have to be crazy to leave it on with no vent for the rad :lol:

    Also I can't see any bubbles in CPU block, I left the fass top off to allow all of that to escape but could there possibly be a bubble in the rad or is that unlikely ?
    Also using a thermometer in the fass the water temp is 32C room temp 24C...

    W00t 2k posts ^^
     
    Last edited: 28 Feb 2007
  7. r4tch3t

    r4tch3t hmmmm....

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    If having the side off isn't too much of a problem, you could have the Rad on its side until you can get the holes drilled. It would also take airflow on the Rad out of the equation if you still have problems.
     
  8. Coolrunnin

    Coolrunnin What's a Dremel?

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    Your temps will indeed drop a lot with an increase in airflow. 3x120 rads need a LOT of air...
     
  9. Nexxo

    Nexxo * Prefab Sprout – The King of Rock 'n' Roll

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    Your radiator is theoretically rated for 1994 Watts --at 100CFM through the rad. However, your 1200rpm fans will generate about 40-45 CFM, of which about 25 will actually make it through the rad. I roughly estimate that the capacity will therefore not exceed 500 Watts.

    Now ogling a graph helpfully provided at Overclockers.com here indeed reveals, at 1400rpm, a capacity of about 340 to 450-ish Watts, depending on flow.

    You helpfully ommitted to mention what CPU you run, but given your mention of Ghz rating, voltages and its shutdown at 61C, I would guess an Opteron 146 (rev. D, 67 Watts) or an Athlon 64 X2 3800+ (89 Watts). The X1900 XT generates 118 Watts. So in total (depending on CPU) you have to displace about 185 to 207 Watts. Your radiator should handle that.

    If it can breathe... Eight mm may seem like a decent gap, but in reality you might as well put your rad directly on the floor. It will not breathe at all. Think about it --its effective intake area is reduced from 432cm2 to 57.6cm2.
     
    Last edited: 5 Mar 2007
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