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post #91 of 216
The 355/ddc is a 'preload sensitive' pump. This means that the efficiency of the pump depends on the pressure / amount of fluid entering / priming the pump.

The top I am using puts these two 355 pumps 'in series'. One pump sends its output directly into the input stream of the second pump. Because the second pump is receiving fluid at an accelerated rate, it pumps fluid out at a much more accelerated rate. From what I have seen at Skinnee Labs, this effect is more than additive.

The human heart is also a pump that is 'preload sensitive'. The left side of the heart is the bigger more muscular side that does most of the work of pumping blood to the entire body. The only purpose of the right side of the heart is to 'preload' the left side so that the left side is more efficient. Without the 'preload' from the right side, the left side couldn't possibly pump enough blood to keep the whole body satisfied.

In short, by running these two 355s in series, I reckon I have 1.5 Iwakies

I think I may need this much power because I will have an Aquarium Chiller in my main loop. Although it wont add much restrictive resistance, I think it will add a bit of work.

In more practical terms, knowing the 355/dcc is 'preload sensitive' tells you that you shouldn't let the pressure go out of your loop before returning fluid to the pump. For example, a waterfall reservoir lets the pressure drop to zero. Water enters the reservoir at the top and flows gently down a couple of levels (waterfalls) and rests in the bottom of the resie at zero pressure. A cylinder resie, that is closed, will allow you to keep any pressure in the loop that is still in the loop after passing through your blocks and rads. In both examples I assume the resie is the last piece in your loop before the pump. If you keep any residual pressure in the loop, it will server to 'push' more fluid into the pump and thus increase 'preload'. But enough of that.. .back to the build.

FlashG
Edited by FlashG - 11/20/09 at 2:54pm
    
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post #92 of 216
You better hit 6GHz 24/7 stable. Going to be an epic rig.
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post #93 of 216
Overkill if ya ask me but nothing wrong with that. I got a GTX 480 running my C2D hehe . Nothing else in the loop.
 
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post #94 of 216
Deft overkill.... for sure.... but like I said earlier, I want to make sure I put in a good cooling system and taking the heat away from the proc quickly with high flows is probably quite important.

I've been doing a lot of reading, and playing at home, on pushing the i7 up through 4.5 to 5.0ghz. Voltage requirements, and thus heat, increase dramatically in this range. Skinnee (Skinnee Labs) is playing around with benches on an OCZ Cryo-Z unit. You can see how heat load increases dramatically even sub zero. I won't be able to take this rig sub-zero because I'm not protecting for condensation. On low humidity days, I will be able to take it down to 10-15C to start.

Bottom line: I will be THRILLED if I can get even a smidge above 5ghz. I think you need LN2 for close to 6ghz. I do have an unlocked xeon w3580, which is a bit of a 'dark horse' and may have way better o/c chracteristics than pliain i7s. Although the proc overclocks on HWBOT suggest maybe the i7 975 goes up to 6ghz easier, I am hoping the w3580 is better around 4.8 to 5 on 'cold water'. At the very least, I know the w3580 will give me MONSTER memory o/cs!!!

Onward with the overkill!!!

FlashG
ps - Have 'plumbed' the chipset water loop. Piccies will follow soon. I know the x58 chipset doesn't get too hot, so this is overkill too... but I'm happy
Edited by FlashG - 11/20/09 at 1:04pm
    
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post #95 of 216
Quote:
Originally Posted by Shrimpykins View Post
Overkill if ya ask me but nothing wrong with that. I got a GTX 480 running my C2D hehe . Nothing else in the loop.
I just looked at your fan shroud build log Shrimpy. I feel like a newb standing in my underware.... I have NO build skills. I am trying my best on this build, but I gotta use all stock bits and I know it is going to look like a FrankenRig to someone like you. Kudos to your shroud....

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post #96 of 216
Unlocked i7 Xeon? Yes please... I'll take one sir.

.......

ZOMG I JUST LOOKED AT NEWEGG. AVERT YOUR EYES!
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post #97 of 216
Quote:
Originally Posted by FlashG View Post
Deft overkill.... for sure.... but like I said earlier, I want to make sure I put in a good cooling system and taking the heat away from the proc quickly with high flows is probably quite important.
Good flow is important. But only to a certain point. There is a point, and it varies depending on the loop components, at which the water is moving at a rate so fast that it can't pick up much heat as it passes through the block. At that point you are just pushing more water than needed. One of those 355's has about 20ft of head which is quite a bit. You would need to put some serious restrictiveness in your loop to get the flow rate to a point where it would be detrimental. That's why I use the 355 and not the 655. Upgradability. You start putting restriction in the loop and a 655 will drop flow considerably where as a 355 won't, so even though it has a lower flow rate, the 355's flow rate is more than enough to begin with and it holds it's own against restriction.

Surface area and turbulence are more key to water picking up heat in a loop than flow is. Unless you go way down in flow. It's on a curve really if you understand what I mean.

Thank you for the compliments on the shroud =). I have been so busy lately I haven't even had a chance to use the darn thing. It's still untapped = \\...
Edited by Shrimpykins - 11/20/09 at 3:35pm
 
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post #98 of 216
I agreee, the relationship between heat uptake and 'flow rate' is on a curve and heat transfer gains for increase in speed will start to drop off with very high flows.

This recent water block review from MadShrimps suggests the block I chose has a reasonably strong relationship between pump pressure (flow rate) and heat transfer, probably because it is a bit restrictive. The heat transfer of the cuplex improved a reasonable amount at the highest pump speed.... so, I figured dual ddcs in series would be better than a single with this block. Especially since I am sending the flow through a BIG rad (GTX 480) AND a water chiller.

I don't think this pump combo will go insanely off the deep end... way too fast flow so it goes onto the downward side of the heat transfer curve... but who knows. I have a controller coming that should allow me to vary the power to the pump and thus flow speed, so I can play around a bit.

If I was really being pure, I would have chosen a different block that is less restrictive and has higher flows at lower pressures.... like maybe the watercool heatkiller... but I LOVE the looks of the cuplex. 'Love' should always have a lot to do with the decisions we make....

FlashG
Edited by FlashG - 11/20/09 at 6:40pm
    
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post #99 of 216
I just stumbled upon this thread, but this has always been an idea in the back of mind for ideal water cooling. This is of course because my passion for aquariums has a long history in comparison to my newfound passion for PC's.

Now I see you're actually putting this into practice! I eagerly await look the results.

But I have a couple of questions, sorry if these were already answered.
1) Do you plan on putting the chiller on the same closed-loop as the PC?
2) Why not use an aquarium (no fish of course!) as a reservoir and then have the chiller on it's own separate pump chill the aquarium. Then have a second pump use water from the reservoir to cool the PC? That's the way I was thinking of applying it.
Edited by Raul-7 - 11/21/09 at 12:04am
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post #100 of 216
1. Yes, I intend to put the chiller in the main CPU loop.

2. That is an excellent idea... but I don't have enough room to do that. My office is a bit to cramped.... and I'm not sure I need such a large reservoir. I think it will work with this loop.. but how knows. Maybe I will do that later.

If you want to see more along the line of the big resie you mention, do a search on some of Walker450's posts. He's done some stuff like that... and more!!!


FlashG
Edited by FlashG - 11/21/09 at 2:24am
    
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