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Multiple Card Question: Series or Parallel Flow?

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post #1 of 13 (permalink) Old 01-01-2019, 04:25 PM - Thread Starter
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Multiple Card Question: Series or Parallel Flow?

Well, I'm starting to narrow my decision on an upgrade for my graphics card down to two NVidia RTX2080ti FE cards. They're the most affordable from NVidia, from what I've seen. (I'm hoping they aren't somehow limited in function compared to third party cards made by others? Comments?) And I'll connect them to my EKWB CE 3x 140mm fan radiator system. According to the EKWB configuration tool, it's a good match for my system as was originally planned and built. (Couldn't have anticipated the RTX cards back then!) But, I don't know if it's better to use Parallel or Series waterflow for the cards. I know that if the header is large enough, water will flow equally into both cards. BUT, part of my brain thinks about the discharge ports on the cards and can't help but wonder how EVENLY the water will flow through each card, given the small header size at the entrance and exit to the ports on the waterblocks.

I'm running the D5 pump/reservoir.

So, which would be better? Parallel or Series?

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post #2 of 13 (permalink) Old 01-01-2019, 04:47 PM
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High flow rates and series is best since you know both cards got complete flow though them. But you run series with low flow rates then the 2nd card is going to get hotter water going into it then the first so will run hotter.
In that case parallel is better.


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post #3 of 13 (permalink) Old 01-01-2019, 04:58 PM
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here is some good info on the subject by toolmaker

https://www.overclock.net/forum/61-w...el-9-6lpm.html

i tried both the fk serial and parallel and saw about a 2 degree difference (better with the parallel) on average for the gpus. keep in mind this is with dual pumps, dual rads, and dual 1070 gtxs...so i am not really putting out alot of heat from the gpus

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post #4 of 13 (permalink) Old 01-02-2019, 04:54 PM - Thread Starter
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Based on feedback from others, I've decided on running them in serial mode...should work out fine. Cards and EKWB parts all ordered! Now the waiting begins...

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post #5 of 13 (permalink) Old 01-06-2019, 08:01 AM - Thread Starter
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Looks like I may have even longer to wait.

Though I made my order with plenty of time for me to work this weekend on my rebuild, a thoughtful EKWB representative monitoring my order and responding to my question about the serial or parallel terminal, extended to me an offer to cancel my order and reorder to get the EKDelights discount. I checked and it would save me $40...not bad, but as I have limited weekends available to work on my rebuild, I REALLY needed to get it done this next weekend. So, I replied and told them I didn't want the discount IF it meant my order would be delayed...and alas, it seems the message won't be received until they return to work on Monday and the last message I received seemed to indicate they had canceled my order so that I could reorder with the discount. The $40 means little to me compared to the scarcity of my available time to work on this project. So, there's like zero chance I'll be able to work on my rebuild for weeks now, though the rest of my order from NVidia, will be here on three days. A month from now it won't matter a bit, but I sure was hoping to get things up and running before the new semester started.

Update: Received an email today from EKWB. Their representative who I've been working with managed to manually refund the EKDELIGHTS seasonal discount to my credit card- which is really nice- AND it also seems my shipping was upgraded! Though it's not in DHL's tracking system yet, their shipping estimates indicate that I should be receiving the package in two days and will be able to teardown and rebuild within my critical timeframe!

YEAH EKWB!

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Last edited by Bighouse; 01-07-2019 at 06:23 AM.
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post #6 of 13 (permalink) Old 01-06-2019, 08:10 AM
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I do agree that series is the best... easier to run the plumbing and pretty much no performance difference from parallel. Even with a single pump the water moves through the system fast enough (and is cooled by the rads) that it barely has a chance to warm up much from the components. I can run my 7980XE up to 90C stress testing and my GPUs are still like 26C

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post #7 of 13 (permalink) Old 01-06-2019, 08:48 AM
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Hi,
Only thing I would do is prioritize the cpu first in the loop from the rad or pump.
7900x will be the hottest item I assure you and you'd want it cooled first before the gpu's

Examples of both
https://www.overclock.net/forum/61-w...l#post27776042

https://www.overclock.net/forum/61-w...l#post27774976

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Last edited by ThrashZone; 01-06-2019 at 08:53 AM.
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post #8 of 13 (permalink) Old 01-06-2019, 09:01 AM - Thread Starter
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Yes. From my reservoir, it goes directly to the center of my CPU. From the out on my CPU, it'll go into the first card, then the second. I'm thinking of putting an inline temp sensor at the intake on the radiator to measure the temp of the water after it's been through the three devices, and one inside my reservoir to measure the cooler radiator water. The one at the top of my reservoir will serve as my air release gap when draining.

Something like this, but I wish the probe was longer to make sure it will hit the water in my reservoir (I like to keep a bit of air in my tube so I can see the water movement.) http://www.performance-pcs.com/bitsp...p-fitting.html

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post #9 of 13 (permalink) Old 01-06-2019, 09:09 AM
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Hi,
I'd just use a Y connection and put the sensor on it
http://www.performance-pcs.com/fitti...gle--y-angle/?

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RAM
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Hard Drive
Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
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evga 1200P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
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CPU
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Hard Drive
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2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
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post #10 of 13 (permalink) Old 01-06-2019, 10:03 AM
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another option...nothing additional required and it is guaranteed to be in the flow. been using one for years

http://www.performance-pcs.com/phoby...ck-nickel.html

Quote:
Originally Posted by h00chi3 go_quote.gif

There are some things that smoke can come out of and still be good, for instance, a bong. Bad things for smoke to come out of, computer parts.


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