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post #21 of 33
Quote:
Originally Posted by joesaiditstrue View Post

somebody did some tests, I can't remember if it were xtremesystems or martins, or some other site but if i recall, they noted higher temps the more tubing that was added
interesting that you find it to be the opposite, i'll try to find the article...

I think that was likely a pump issue, The more components and the more tubing the harder the pump has to work to keep the water going, So the rate would go down and the water molecules would have longer time exposed to the heatsources.
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post #22 of 33
It wouldn't make sense if less water would hold more heat. A lesser volume of water would heat up faster than a larger body of water if both are being cooled at the same rate.

If you heat a cup of water vs a pan of water (assuming both were heated the same rate), which would boil first? This is kind of common sense if you've taken any physics or thermal classes.

The only way more water could get higher temps is if the tubing and blocks are restrictive enough to slow down the pump, meaning a slower flow rate and this goes with what Rayleyne above said.
post #23 of 33
Quote:
Originally Posted by joesaiditstrue View Post

somebody did some tests, I can't remember if it were xtremesystems or martins, or some other site but if i recall, they noted higher temps the more tubing that was added
interesting that you find it to be the opposite, i'll try to find the article...

Actually you are both right. The more tubing you have, the more water is in your loop just like adding small increase volume to reservoir, so it will take another 15 seconds or so to heat the water to final equilibrium. But final equilibrium will be ~ 0.05C higher, since the flow will decrease about 0.05gpm for extra foot of tubing. So temps will slightly rise by ~0.05C from decreased flow to rad and block, but just like adding more water to a res, the time to loop equilibrium will increase a few seconds. Neither effect would you be able to measure by increasing 1 foot of tubing, have to add 10 feet, measure, then extrapolate back to be able to measure the effect assuming you have multiple dallas 1 wires in water and measuring each air intake. (swiftech white paper showing increasing flow to rad does increase cooling, in case anyone want to incorrectly argue the opposite)

When you increase the diameter of tubing, then you are increasing flow per unit time, and then you would decrease temps slightly since increasing flow per unit time to rad and cpu block slightly. However going from 3/8 to 1/2 inch ID tubing the increase in flow is only about 0.15 gpm and effect on temps only about 0.15C, Cathars testing here.

Loop order doesnt matter since it takes ~400W to heat water by 1C at flow rate of 1.5gpm (typical flow in loops). For example, when I put multiple probes (capable of 0.1C accuracy) in my water loop at various points, and each air intake... With 1 x 360 rad, 1 cpu loaded 130 watts when I first start prime my water temp is 25.5C, ambient is 25C. With 130 watt loaded cpu, the temp of water increases by 0.3C going through my cpu block with each pass. The rad cannot cool water per pass by 0.3C since rad is not efficient at cooling 25.8C using ambient of 25C, needs higher temp differential between ambient and water temp to cool more efficiently. So each pass for 7-8 minutes the water temps slowly increases by 5C to 30C, now with 1x360 rad at steady state the water temp is 30C, ambient 25C (here rad now efficient enough to cool cpu by same it heats water 0.3C per pass, and cpu temps for example are 75C at load. Delta air to water is 5C at steady state, but on each pass, the water temps is 0.3C hotter coming out of block, and 0.3C cooler coming out of the rad. So if I had a gpu at load in there, the 200W load means a pass difference of 0.5C, so I could get 0.5C lower temps by going to cpu first then gpu, with 2 gpus, get 1C better temps. But running prime gpus are idle, so really only get 60W with 2 gpus idle, so only about .15C better temps if making sure cpu temps get water first. If I add a second rad, I decrease that delta air to water by half, ie to 2.5C since doubled rad surface area (assuming same fan speed), and now temps 72.5C.
Edited by opt33 - 8/14/12 at 5:41am
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post #24 of 33
I actually made this graph quite a while ago, it was in my first ever post on this forum in fact.

6ae54218_vbattach171217.jpeg

It shows the temperture rise (or drop) of the water going through a component against the absorbed (or released) power at certain flow rates.

The main thing to take from this graph is that it takes a lot of heat (power) to raise the temperature of the water. However the water does vary as it goes through the loop; it will be warmer after going through a block and cooler after going through a rad. The temperature of the water does not stay constant, if it did we would not be able to transfer heat.

With that in mind you can see why people don't usually bother about loop order in terms of temperatures, and more focus on aesthetics and convenience as it is not worth trying to save ~0.5°C. However should you have 4 hot GPUs (480s for example) then it would make sense to put them after the CPU, or put a rad in between them and the CPU, to save the 4°C or so from the GPUs.

Bottom line, there is no "hot" or "cold" water, just slightly warmer and slightly cooler water.
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post #25 of 33
Thread Starter 
Quote:
Originally Posted by joesaiditstrue View Post


edit: and yes, you can mod your H100 to cool a 5770, there are threads here where people have attached their H100 to other GPU's smile.gif

i dont want to mod the h100 to work on the 5770 alone.
wondering if i got a waterblock for the 5770 if i could take the hosing off the h100 and run it first to the gpu, then cpu, back to the h100 rad.
not sure if the pump is strong enough to do that but, why pay more when i could drop about $60 on the block and then just buy some tubing.

anyone know if the pump could take it?
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post #26 of 33
Quote:
Originally Posted by Jollyriffic View Post

i dont want to mod the h100 to work on the 5770 alone.
wondering if i got a waterblock for the 5770 if i could take the hosing off the h100 and run it first to the gpu, then cpu, back to the h100 rad.
not sure if the pump is strong enough to do that but, why pay more when i could drop about $60 on the block and then just buy some tubing.
anyone know if the pump could take it?

I don't think you can do that, Corsair H series are closed loop systems for a reason, increasing the water and distance on the loop will not work well with the h100 pump.
I never actually tested, but it doesn't seem like a good idea to me.
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post #27 of 33
Also, I don't think the pump/rad connections are standard, you might not find proper tubing or being able to seal it properly.
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post #28 of 33
Quote:
Originally Posted by Jollyriffic View Post

i dont want to mod the h100 to work on the 5770 alone.
wondering if i got a waterblock for the 5770 if i could take the hosing off the h100 and run it first to the gpu, then cpu, back to the h100 rad.
not sure if the pump is strong enough to do that but, why pay more when i could drop about $60 on the block and then just buy some tubing.
anyone know if the pump could take it?


That is soo not worth doing.
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post #29 of 33
Quote:
Originally Posted by tsm106 View Post

That is soo not worth doing.

Yup. Cost of block>value of card.
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post #30 of 33
Thread Starter 
i fold on this card. pc is right next to me and all i hear is that fan.

universal waterblocks on an old card aren't a waste. can always take it and drop it onto something new down the road.
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