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First time full water cooling, is my loop okay ? - Page 2

post #11 of 19
Thread Starter 
Quote:
Originally Posted by Kinru View Post
That pump is WAAAAAAAAAY overpriced and unnecessary.

2 MCP35x's in serial would serve you way better. Or you can get the double top for the MCP355 which would be nearly the same (no PWM and maybe slightly louder which can be handled with getting a foam pad for it).
One thing I forgot to say in my post is that I'll have a lot of quick-disconnects, 90° turns and compression fittings. What's more, be radiators will be quite higher than my whole PC, so that might have an impact as well.

So you think I should add more pumps to get a flow rate of at least 1GPM ? Or do you mean to say that 2 MCP35x are better than 2 PMP-450S at 24v ?
post #12 of 19
It really doesn't make a difference because your water temperature will equalize throughout the loop. Yes the water coming out will be slightly warmer than the water coming in, but with 4 480s the difference is so negligible creating an entire second loop is unnecessary.

Now if you wanted to do it for looks, such as having 1 loop being 1 color and the other loop being another, that is different and entirely up to how much money you would like to spend.


EDIT: Hmm I was under the impression that the 35x/355 have better head pressure than the d5, however I am not completely sure about the 24v version. Someone more experienced than me could probably tell you, but I would need to go check the exact numbers. I apologize if I have confused you.


EDIT2: I just checked martin's review of the pump and I have to say that it is also unnecessary (especially 2 O.O). 2 35x's or 355s will serve you better as you are able to put aftermarket tops on them, thereby giving you the chance to use compression fittings with them. With that pump at 24v Martin states that using a aftermarket top makes it too susceptible to vibrations. The other pumps have more than enough power as well (and you can always get the triple pump top option if you want).
Edited by Kinru - 4/16/11 at 2:12pm
post #13 of 19
Thread Starter 
Quote:
Originally Posted by Kinru View Post
EDIT2: I just checked martin's review of the pump and I have to say that it is also unnecessary (especially 2 O.O). 2 35x's or 355s will serve you better as you are able to put aftermarket tops on them, thereby giving you the chance to use compression fittings with them. With that pump at 24v Martin states that using a aftermarket top makes it too susceptible to vibrations. The other pumps have more than enough power as well (and you can always get the triple pump top option if you want).
But then I'd have to change my reservoir...because the way it is made, the two pumps are directly attached to it. And I must say I quite its design. Plus, its a dual 5.25" bay reservoir, that means I don't have to find space for one inside my case.

I just found this picture on Martin's website :


From what I gather, one pump at 12v will have 1GPM for a very restrictive loop.
So 2 of these @ 24v should be more than enough from what I understand.
post #14 of 19
You don't want 2 of those at 24v attached to the reservoir, the vibrations are going to be insane.

If you read the full review Martin states that if you want to use the 24v then leave the stock tops on, which means you couldn't use the reservoir. I recommend normal D5s at 12v for that reservoir, 2 of them will give you the flow you are looking for, I can guarantee that.
post #15 of 19
When you're filling the loop I think I would move the rads to a lower position and turned upside down, maybe even fill them separately then connect to your loop. Gravity should help a lot.
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post #16 of 19
Quote:
Originally Posted by MrJackson View Post
When you're filling the loop I think I would move the rads to a lower position and turned upside down, maybe even fill them separately then connect to your loop. Gravity should help a lot.
Unnecessary, he is going to have way more than enough pump power to do anything he wants with 2 NORMAL d5s, 2 at 24v is overkill for anything.
post #17 of 19
Quote:
Originally Posted by Kinru View Post
There is no benefit to having 2 loops, it has been proven and stated MANY times here. It is way better to have 2 pumps in serial and have a single loop that goes through everything.

It makes things less complicated and saves money as well as there is no decrease in performance.

Sorry I did not see that the coolant was colorless, however, like others have said, nothing does better than distilled water so I would still highly recommend that.

The other thing I would suggest if you are going for silence, would be to get either the SR-1 serires or XSPC RX series rads. They are optimized for very low speed fans and with 4 480s you could run at 1000rpm which is completely silent and get the temps you are looking for.
I agree that there is not a big difference in performance of one loop vs two. Your statement of one loop being less complicated seems to not apply here. I was suggesting the dual loop might be simpler in this case compared to the single loop mapped out by op. I guess I should have stated it clearer. His scenario has a ton of issues that can easily be mitigated by two loops.
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post #18 of 19
There is no better kill than overkill

But seriously, build your system, then populate your rad box one rad at a time. because one 480 rad will keep your system cool, two will be awesome, and three will be showing off and 4 that is epeen only!

I have a 920@4.0Ghz, 2x gtx480s @850/1700/2100 cooled with a single '68 bonnie heater core and 4 silent fans...
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post #19 of 19
Ah, I only just noticed that you are planning on splitting the flow. I should really pay more attention to reading things!

That is generally not a good idea, as one branch might get a lot higher flow rate than the other depending on the relative restriction of the components. I would stick to putting everything in serial, with the possible exception of your GPUs.

I believe your reasoning for splitting the loop was so that the CPU and GPUs receive water at about the same temperature. Time for the fun fact of the day:

It takes ~250W to raise water by 1°C at 1GPM.

Therefore, assuming that your chip is running at 200W and you board at 50W, so long as you are over 1GPM the water going into your GPUs will be ≤1°C warmer. I can't see that being a problem.

I would really look at putting everything in series, OK it will raise the overall restriction of the loop but it avoids potential flow balance problems and will not have much of an effect on temperatures.
Edited by GingerJohn - 4/17/11 at 12:29pm
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