Circulating Bubbles. Help?

Yeah, flow rate doesn't seem to affect things that much, as long as there is flow!

They show the calcs that explain why component order doesn't mean anything measurable though, which is why we got involved in the first place I think! :)

The link also shows how heat dump from pumps isn't really an issue either, and the pumps they use in the calculations are far more powerful than the OP's DDC pump, so the effect will be even less.
 
I've seen 6 or 7 systems now where the DDC 18W is just too much for a short, low restriction loop. With an EK reservoir, a massive cyclone effect is seen and air is injected into the loop, with the Alphacool reservoir top, the same thing happens except that it's more of a foamy thing. Try running it at 5V and see it improves - it generally does.
 
Yes, I had an old thermaltake p400 pump that did the job just fine....the only reason I upgraded was because I plan on putting in a restrictive block like the D-tek fuzion and possibly another 120.2 rad, and I didn't think the p400 pump would be up to that job with only a 2.1m lift
 
Tooks said:
Just thought I'd post this useful link for those still struggling with how pc watercooling works!! :)

http://www.overclockers.com/articles1088/
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I wouldn't go too strongly with that entire article. Every thing it says is true but its talking about the good old days 8/19/04 and only taking into account the heat created by the pump and as I stated earlier is very little. Its Doesn’t take into account the extra heat generated by 2007 terms of duel/quad heat outputs or even consider the amount of heat generated buy a 8800 munching up 250+ of power. It also doesn’t take into account flow speed regarding cross flow or duel pass radiators if it really wants to get technical.

From my own experience of running a Socket 754 3400 clocked into a 6800gt clocked to vies versa I saw a 10 to 13 degree difference in cpu temperature but only a 5 degree in the graphics temperature. The +5 degree on the graphic didn’t bother me too much cause it had come down by 20 from air cooling. That 20 went somewhere!

Didn’t want to start a war just giving my option and experience from trying myself. Take it or leave it.
 
WJA96 said:
I've seen 6 or 7 systems now where the DDC 18W is just too much for a short, low restriction loop. With an EK reservoir, a massive cyclone effect is seen and air is injected into the loop, with the Alphacool reservoir top, the same thing happens except that it's more of a foamy thing. Try running it at 5V and see it improves - it generally does.
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Thats exactly whats happening, its like a cyclone of air bubbles coming from the EK block, and I get a foamy thing happening in the alphacool res. How do I turn it down to 5v? Will have to try that.
 
YZFAndy said:
I wouldn't go too strongly with that entire article. Every thing it says is true but its talking about the good old days 8/19/04 and only taking into account the heat created by the pump and as I stated earlier is very little. Its Doesn’t take into account the extra heat generated by 2007 terms of duel/quad heat outputs or even consider the amount of heat generated buy a 8800 munching up 250+ of power. It also
Click to expand...


Article said:
Water has a thermal capacity of 4186J/Kg-C at 22ºC and a density of about 1g/mL

With a flow rate of 1 gpm, that's ~3.75 liters/minute (lpm).

3.75 lpm / 60 seconds= 0.0625 liters or kilograms through the waterblocks per second.

4186 * 0.0625 = 261.625 W/C

So that's 1ºC warmer for every 261 watts;
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So let's assume that the quad-core you have is 200W and the 8800GTS is 250W and your pump is 50W. The equation above shows a 2C temperature increase a 1gpm. Higher than the article states but only because I've included a very high heat load.
 
YZFAndy said:
Didn’t want to start a war just giving my option and experience from trying myself. Take it or leave it.
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And me likewise. :)

The article may be old, but the laws of thermodynamics haven't changed in the last 2 or 3 years.

The wattage of newer components may be higher, but they're still very small in the grand scheme of things, as Mike Timbers example shows.
 
WJA96 said:
I've seen 6 or 7 systems now where the DDC 18W is just too much for a short, low restriction loop. With an EK reservoir, a massive cyclone effect is seen and air is injected into the loop, with the Alphacool reservoir top, the same thing happens except that it's more of a foamy thing. Try running it at 5V and see it improves - it generally does.
Click to expand...
I found out about the 4-pin connectors online and switched it around, and you're right. No more bubbles, not even the spiralling ones coming from the GPU block. Theres a few small ones that seem to be stuck, but I imagine they'll slowly work their way out.

The water is moving very slowly though. Does that make a difference? I don't know if its me being paranoid or what, but the temperatures seem a centigrade or two higher since switching.
 
WJA96 said:
Then try 7V for a nice compromise?
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How do you get 7v?

What I read is basically on a four pin you have: 5v - 5v Earth - 12v Earth - 12v.

How do you get 7v out of that? 12v with a 5v earth is the only thing that combines to the right amount, but wouldn't that leave those 7 volts unearthed and thus dangerous to the circuit?
 
The downside of the 7V mod is that it needs all 4 cables connected, or, as you say, you don't get an earth. But it won't be dangerous, it just plain won't work.
 
7V mod should work fine. those 7 volts are still referenced to earth, they just start 5v higher than earth, which isn't a problem :)

The only possible issue is that the return current will be into the 5V line of the PSU, but that current will end up feeding something in the PC which is using 5V anyway, so it won't be a problem.

The 2 earths (also known as 0V) on the 4 pin are joined together in the PSU. The reason for having 2 of them is because if both the 12V and 5V are carrying a lot of current, one 0V cable for the return current would get too hot and melt the insulation. But I digress....
 
Dont mod it, i have the same setup and had the same problem.
All you need to do is put some pump filter foam in the bay res this stops the swirling action. Its sorted now, when i get home i will see if i have some filter left for you.
 
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