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Flow and at what point do you need to add more pumps or another loop?

post #1 of 11
Thread Starter 
So...I have a solid current setup that does what I want but...time to add more "stuff".

Current: EK DCP 4.0 12V pump->EK 360 XT Rad->EK Supreme HF->Stealth 120 Rad->Koolance GTX 460 block 1->Koolance GTX 460 block 2 (parallel)->EK Reservoir-back to pump. I only have three 90 degree fittings (rest are straight or 45 degree).

I get nice temps, I can OC my i7 920 to 4Mhz no problem and all is well. So I'm adding (this weekend) an EK RAM block and I have a EK 240 Rad at my disposal. I know that temps eventually even out no matter where you put your RADS...and I will eventually (next month or two) get the EK NB/SB blocks for my EVGA SLI board. I can fit all this inside my ATCS 840 case so that's not an issue. I can even add the 240 RAD to the flow and leave the 120 in as well (overkill I'm sure).

What I'm wondering is w/restrictive nature of the NB/SB blocks, adding that third radiator...at what point beyond getting my epeen higher would there be a reason for another loop or adding another pump (or going for a higher flow-rated pump)? Is there a theoretical "bad" flow to be at (skineelabs spreadsheet)?
Edited by FuzzDad - 3/20/11 at 4:28am
post #2 of 11
Basing on some calculations I did the other day, if every block you add would decrease the waterflow by 1GPM, you'd need 5 blocks to hit the pump's waterflow threshold for a properly performing loop.

I have the same one with two fairly restrictive blocks (two CPU blocks + 2 240 rads) and I still have plenty of pressure.

You should be okay, the FC blocks for GPUs don't add that much of a restriction.
I bet you can even throw in a pair of GPU blocks and it would still perform great.
   
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post #3 of 11
You can try my spreadsheet if you want:

http://martinsliquidlab.org/pump-and...r-spreadsheet/

Just substitute if it's missing a component, it's just a ballpark estimator anyhow.

I always suggest 1GPM or better as a very rough rule of thumb, but you can even go a bit lower than that. We really don't start seeing major CPU block performance drops until you get in the .5-.7GPM range, but many people start having bleeding problems when you get down below 1.0 or so particularly with inverted radiators, etc. You can get an air pocket that's really hard to flush out.
    
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post #4 of 11
Thread Starter 
Appreciate it...with reasonable substitutes I see 1.15->1.2 GPM depending on what I choose until I add in the NB and SB blocks...start to get near 1 GPM at that point...reasonable once again considering by that time I'd have three rads (720 combined) and six blocks.

I know you are testing the new Koolance twin reservoirs...will be interesting to see what the 452X2 can do w/two 450S in serial. That should be some serious pumping action.
post #5 of 11
Personally I'd choose single pump vs dual pump any day.

Mostly because of the performance increase of the second pump. You know, it isn't gonna be 100% increase. Actually I'd love to see if it's even close to 50-60%.

Multiple rads with multiple pumps... Bad idea hydrodynamically-wise. As I said, I'd choose double loop any day instead of single loop with dual pumps.
   
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post #6 of 11
Thread Starter 
Got it all together and all in the case...it's a bit of a mess (wiring not completed, my loop isn't pretty, it's pretty cramped in there) but it cools great. The added 240 now gives me water temps @idle only 4C higher than ambient. Single pump is moving plenty of water. 4 Typhoons at 1450, two Loons at 1050...hit 61C max on 30 minute Prime95 run. GPU's also benefiting from added rad and idle at 23C (down a few degree's). Also removed the mounting plate off the pump and let the pump rest on foam from RAM block box...and it's very quiet. I'll take some pics in the AM.
post #7 of 11
Put the GPU blocks in parallel if you are worried about flow, it will help a lot.

It will reduce the restriction from 2x (assume x = restriction from a single block) to x/2
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post #8 of 11
Quote:
Originally Posted by FuzzDad View Post
Got it all together and all in the case...it's a bit of a mess (wiring not completed, my loop isn't pretty, it's pretty cramped in there) but it cools great. The added 240 now gives me water temps @idle only 4C higher than ambient. Single pump is moving plenty of water. 4 Typhoons at 1450, two Loons at 1050...hit 61C max on 30 minute Prime95 run. GPU's also benefiting from added rad and idle at 23C (down a few degree's). Also removed the mounting plate off the pump and let the pump rest on foam from RAM block box...and it's very quiet. I'll take some pics in the AM.
Nice!

I suspect most people will benefit from one big loop with multiple rads more that separate just from the fact that you get to share rad capacity and most of the time you load one or the other and not both fully. I've noticed that during gaming I rarely load the cpu much, so it's usually one or the other or half of each, but rarely is there something that can load both simultaneously.
Edited by Martinm210 - 3/19/11 at 8:30pm
    
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post #9 of 11
Thread Starter 
I just crammed the wiring in to get some pics and I have not finished sleeving and fixing all my sleeving mistakes (I don't know how those guys at MDPC do it...)...but here's some pics of the stuff I've crammed into the case:

Spaghetti



RAM-CPU-GPU Loop




Reservoir->Pump->360Rad->Ram Block->CPU->120Rad->GPU1->GPU2 (parallel)->240Rad->Back to Reservoir



Still have a lot of sleeving to do and cable management...all that sleeving adds bulk to the back of the case...but there's no issue w/water cooling loop or pump having enough power to handle it.
post #10 of 11
Looks... Amazing...
   
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