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Running GPU and CPU in parallel in the loop?

 
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post #1 of 9 (permalink) Old 02-28-2019, 06:55 PM - Thread Starter
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Running GPU and CPU in parallel in the loop?

I keep seeing a lot of builds going this route. It looks clean but I have yet to see anyone to report back anything on the cooling impact of halving the flow rate to the CPU. Has anyone done this before and what input do you have on parallel vs series to blocks?
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post #2 of 9 (permalink) Old 02-28-2019, 08:17 PM
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Haven't done this personally, but there's plenty of builds like that here on OCN, and on the Internet in general, and it works just fine, assuming all else is done right, and the pump creates enough flow - which it will unless you add tons of restriction elsewhere in the loop.

If this makes for cleaner tubing routing in your build, go for it.

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post #3 of 9 (permalink) Old 02-28-2019, 08:47 PM
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it's been a while since iv'e seen this video, although i'm pretty sure jay covers that orientation in this vid:

orientation doesn't make any significant difference if your loop has been "done right".
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post #4 of 9 (permalink) Old 03-01-2019, 12:26 AM
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Quote: Originally Posted by blnk View Post
it's been a while since iv'e seen this video, although i'm pretty sure jay covers that orientation in this vid:

orientation doesn't make any significant difference if your loop has been "done right".
That's about components in serial. Parallel is something totally different.

@TS: Xtremerigs tested this: https://www.xtremerigs.net/2018/02/1...s-performance/
If you ok with a small drop in performance, you're fine.

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post #5 of 9 (permalink) Old 03-01-2019, 07:43 AM - Thread Starter
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Quote: Originally Posted by broodro0ster View Post
That's about components in serial. Parallel is something totally different.

@TS: Xtremerigs tested this: https://www.xtremerigs.net/2018/02/1...s-performance/
If you ok with a small drop in performance, you're fine.
Thanks, that link was helpful. It totally answer the question I had but also gave me some performance data on cpu blocks I didn't know about either.
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post #6 of 9 (permalink) Old 03-01-2019, 11:18 AM
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Quote: Originally Posted by tintreach View Post
I keep seeing a lot of builds going this route. It looks clean but I have yet to see anyone to report back anything on the cooling impact of halving the flow rate to the CPU. Has anyone done this before and what input do you have on parallel vs series to blocks?

I parallel all of my water loops today.

my test build
https://www.overclock.net/forum/61-w...el-9-6lpm.html
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https://www.overclock.net/forum/61-w...ooled-rig.html
my extreme build
https://www.overclock.net/forum/62-p...c-cooling.html
as you can see I have been doing this for some time.

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post #7 of 9 (permalink) Old 03-01-2019, 01:20 PM
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Flow rate is what cools the blocks lower...then water temperature which is determined by how fast the fans are moving.
Halve your pump and see it it gets worse significantly...probably will need to double that pump speed when you parallel loop for equal flow rate.
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post #8 of 9 (permalink) Old 03-07-2019, 10:02 AM
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I'm assuming we're not using two pumps for separate loops for obvious reasons. Regardless most pumps now days could run a single CPU/GPU loop in parallel easily. Unless you're running some old junker, i'd say anything over 500l/h with decent head pressure should suffice.

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post #9 of 9 (permalink) Old 03-07-2019, 10:04 AM
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I've ran 3x gpu in parallel, to an entire cooled board (mem, chip, set) n had no issues or differences compared to when I used a serial block.

I'm however running MCP35x2 @ full tilt due to the sheer size of my loop. Water barely hits 1GPM, in serial or parallel.
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