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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums. |
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#151 |
Cooling Savant
Join Date: May 2003
Location: Midwest
Posts: 157
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Fluke clamp on has a NIST caliberation cert.
measuring single DC line do not understand why so low reading, brain fuzzy from holiday party doesn't help.... |
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#152 |
Cooling Savant
Join Date: Mar 2003
Location: North Carolina, USA
Posts: 225
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A clamp on meter cannot measure DC current -only AC.
It is all physics ...ie rising and falling magnetic fields aka AC. ![]() The reading you are getting is inaccuracy or noise on the DC line. edit: spelling
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#153 |
Thermophile
Join Date: Sep 2002
Location: Melbourne, Australia
Posts: 2,538
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Took some time to measure the PQ curve of RD-30 at 18.0v.
I arrived at the following curve. Everything above 6LPM is measured. The curve below 6LPM is what I extrapolated as I ran out of vertical height. I'll have to set up the tubing test outside the front of the house on the ground beside the main entrance stairwall landing and run tubing up to the roof peak (2-story house) in order to get more height and get a firm fix on the pump's peak dead-head, but I reckon somewhere between 7 to 8mH2O will be pretty close, and is not going to alter the graph in any dramatic fashion. I tried to measure peak dead head at 17.0v, but it was also above 6.0mH2O. So yeah, 18.0v for the RD-30 is still very, very strong, but with a (relatively) lowly 28-30W power draw in the "typical" 6-10LPM range. ![]() This is one heck of a pump, with every single desirable characteristic you want, except for the voltage requirement. Strong, wide PQ curve, able to service both high and low restriction blocks. Very quiet. Moderate power draw. Fairly small (marginally larger than a D4). I will do an "inline heat dump" test when I next get some time to complete the analysis. Still, even if it were dumping 100% of its power draw into the water as heat, this would still make the pump near ideal for dual-fan radiators or anything larger. |
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#154 |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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THe question at hand is at what voltage yeilds the best overall temps? What is the power draw at 24v and would the extra flowrate at 24v be negated by the additional heat? Also, may be a dumb question but are there any reprocussions of undervolting the pump? Now I'm really itching to get mine installed.
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#155 | ||
Thermophile
Join Date: Sep 2002
Location: Melbourne, Australia
Posts: 2,538
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![]() Quote:
A hotter CPU will benefit more from a hotter/stronger pump because the temperature delta bonus from the increased flow rate is greater with the hotter CPU. The better the radiator, the stronger and hotter the pump can be without the water warming up by much. If the radiator had a theoretical C/W of 0 then you can stick a 1HP pump on there if you wanted. Given your setup though, with a hot CPU and a strong radiator setup, you will be able to run the RD30 at 24v or even 26v and still see better temps, but overall I think you will basically witness a near plateau (~0.2C variation) between giving the pump 20v up to 26v, in which case you may as well just use 20v and be sucking down less power. Give it a go. Even with my present 2 x D4's and the big 30x24cm radiator I see CPU temps plateau between 12-14v on the pumps, and above 14v the CPU temp will start to climb as the water starts to get a lot warmer. Quote:
Should be no repercussions with undervolting so long as you're not right near the point where the electronics are struggling and the pump starts stalling. Really anything at or above 14v should be fine. |
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#156 | |
Cooling Savant
Join Date: Apr 2002
Location: North of France
Posts: 198
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#157 | |
Cooling Savant
Join Date: Mar 2003
Location: North Carolina, USA
Posts: 225
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![]() Granted, I was too literal in saying that it is impossible to construct such a device (or that they might indeed be available), but the clamp-on ammeters that someone asking questions here might have will not measure DC Current through the inductive (clamp-on) coil. I am not getting in a flame battle here -say what you want. I am sure that I could learn something from you. If there is a common field test instrument that you are speaking of -please post so that I can investigate the instrument for my use at work. ![]()
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#158 | |
Cooling Savant
Join Date: Sep 2003
Location: Vallentuna, Sweden
Posts: 410
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You are totally wrong.
They are very common. http://www.tequipment.net/AmprobeACDC-600A.asp http://www.tequipment.net/AmprobeACDC-600AT.asp http://www.inotek.com/Catalog/tifet.html http://www.hotektech.com/GMCMetraclip70.htm Quote:
Five minutes with google. |
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#159 |
Cooling Savant
Join Date: Mar 2003
Location: North Carolina, USA
Posts: 225
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Thanks for the five minutes. I am proved wrong.
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#160 |
Cooling Savant
Join Date: May 2003
Location: Midwest
Posts: 157
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hmmm, easy lads, I did make a mistake by grabbing the wrong clamp-on, wanted our Fluke 336 that happens to be out on a customer site
also lowered RD-30 to 21.1v (low as adjustment pot goes) Last edited by brucoman; 12-07-2004 at 04:16 PM. |
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#161 |
Cooling Neophyte
Join Date: Jul 2004
Location: Oklahoma
Posts: 62
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Cathar
What about the Mag3 pump? It outperforms the Eheim by far. Just wondering your conclusions on how it would factor in to this scenario. Thanks for such in depth study. It has shed quite a bit of light for me.
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#162 | |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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#163 | |
Cooling Savant
Join Date: May 2003
Location: New Smyrna, FL
Posts: 258
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#164 | |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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__________________
*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* E6700 @ 3.65Ghz / P5W DH Deluxe / 2GB 667 TeamGroup / 1900XTX PC Power & Cooling Turbo 510 Deluxe Mountain Mods U2-UFO Cube Storm G5 --> MP-01 --> PA 120.3 --> 2x DDC Ultras in Series --> Custom Clear Res "Artificial intelligence is no match for natural stupidity." 1,223,460+ Ghz Folding@Home aNonForums *:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* |
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#165 |
Cooling Neophyte
Join Date: Dec 2004
Location: University of the Pacific, Stockton, California
Posts: 4
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I'm pretty interested in the undervolted RD-30, so I went around looking for some PSUs that might do the job, I found two that looked good to me, but wasn't sure which would be most suitable for the job. I found these two:
http://www.peaktopeakpower.com/catal...well/s-60.html http://www.peaktopeakpower.com/catal...well/s-40.html I am thinking that, according to the data, the S-40 should do the trick, but I'm not sure how to tell how much the voltage can be adjusted - it gives figures all the way to 24v, but it says there is only a 10% voltage adjustment on it. Am I reading this correctly? |
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#166 |
Thermophile
Join Date: Sep 2002
Location: Melbourne, Australia
Posts: 2,538
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Just to be safe/sure I would probably go with a 100W rated PSU at the least, such as this one:
http://www.peaktopeakpower.com/catal...ell/s-100.html Officially the voltage adjust is +/-10%, but my Meanwell 24v PSU goes down to 17.0v with the voltage adjust, and nikhsub1's goes down to around 14v so he says. |
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#167 | |
Cooling Savant
Join Date: May 2004
Location: Kingston, NY
Posts: 269
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#168 | |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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__________________
*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* E6700 @ 3.65Ghz / P5W DH Deluxe / 2GB 667 TeamGroup / 1900XTX PC Power & Cooling Turbo 510 Deluxe Mountain Mods U2-UFO Cube Storm G5 --> MP-01 --> PA 120.3 --> 2x DDC Ultras in Series --> Custom Clear Res "Artificial intelligence is no match for natural stupidity." 1,223,460+ Ghz Folding@Home aNonForums *:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* |
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#169 |
Cooling Neophyte
Join Date: Sep 2004
Location: Oklahoma
Posts: 43
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niksub-
Just wondering if you have found a company that actually stocks the RD30? I have called around to locate the pump but so far I have only found it available via special order. This means its basically full list which is around $275. Normally if a company buys them to stock they tend to drop significantly in price. Unfortunately $300 after shipping is a bit steep for me versus the more readily available pumps. Any suggestions? |
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#170 | |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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__________________
*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* E6700 @ 3.65Ghz / P5W DH Deluxe / 2GB 667 TeamGroup / 1900XTX PC Power & Cooling Turbo 510 Deluxe Mountain Mods U2-UFO Cube Storm G5 --> MP-01 --> PA 120.3 --> 2x DDC Ultras in Series --> Custom Clear Res "Artificial intelligence is no match for natural stupidity." 1,223,460+ Ghz Folding@Home aNonForums *:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* |
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#171 |
Cooling Savant
Join Date: Apr 2004
Location: Wisconsin
Posts: 120
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I am kicking myself right now too. I remember when yopu 1st posted the link on OCF and didnt give it much more than a passing thought. I think if I saw the same right now I would of bought all 6 lol.
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#172 | |
Cooling Savant
Join Date: Mar 2003
Location: North Carolina, USA
Posts: 225
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#173 |
Cooling Savant
Join Date: May 2003
Location: Midwest
Posts: 157
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& I got one from the guy as well....
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#174 |
Cooling Neophyte
Join Date: Mar 2004
Location: Spain
Posts: 10
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CoolRod:
Must give thanks from me and Sunwong for your incredible "work" on e-bay for the pumps... ![]() ![]() We´ve bought also a Meanwell 24V PSU... So, you said that this PSU´s could undervolted to 15V? Hm, could be nice then to have not too much noise... Only with the voltage adjustment on the PSU, right? without any adaptor... if so, nice... Thx again. Kind regards, friku. (No final smilie..., sorry, remember bad things about it... Cathar, you know... ![]() |
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#175 | |
c00ling p00n
Join Date: Jun 2002
Location: L.A.
Posts: 758
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__________________
*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* E6700 @ 3.65Ghz / P5W DH Deluxe / 2GB 667 TeamGroup / 1900XTX PC Power & Cooling Turbo 510 Deluxe Mountain Mods U2-UFO Cube Storm G5 --> MP-01 --> PA 120.3 --> 2x DDC Ultras in Series --> Custom Clear Res "Artificial intelligence is no match for natural stupidity." 1,223,460+ Ghz Folding@Home aNonForums *:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:*'``'*:-.,_,.-:* |
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