GPU and CPU blocks in parallel?
- Thread starter Dinko
- Start date
Asperatis
New member
Why would you even use that t-fitting there? 
Drop that one and use one entrance and one exit port on the cards. What you do in between the two cards is completely up to you. Personally I like a parallel setup for its looks. Performance wise there's little to no difference at all
Drop that one and use one entrance and one exit port on the cards. What you do in between the two cards is completely up to you. Personally I like a parallel setup for its looks. Performance wise there's little to no difference at all
Mysterae
New member
Incorrect, sorry bud.
That loop is perfectly fine for a parallel circuit, where all 3 blocks are in parallel.
Water will follow the path of least resistance, and each block presents some resistance. Once one block is met, the water will go to the next block, and again the next. It won't resist itself so when it meets itself at the junctions, it'll merge and flow back to the pump. Hope that makes sense!
Had you of drawn the connection of the bottom gpu to the rad differently, such as green of bottom gpu to red of the rad, then that would be very bad - no blocks would have been in circuit.
Ahh yeah ofc, don't know why I didn't see that it will still cross the first card, It looks so asymmetrical. Either way to me getting rid of the T and having the CPU in series seems like a cleaner and simpler approach. Ain't like restriction is an issue with two D5's
JR
Mysterae
New member
Ahh yeah ofc, don't know why I didn't see that it will still cross the first card, It looks so asymmetrical. Either way to me getting rid of the T and having the CPU in series seems like a cleaner and simpler approach. Ain't like restriction is an issue with two D5's
JR
Kind of.
If the T junction is done away with and the output of the pump is connected to the CPU and the rest of the circuit is kept as is, that'll be very bad for the GPUs. The flow will come out of the CPU and bypass the GPUs completely, down that red path. The corrective action would then do away with the red connection between GPUs, thus making it a series circuit.
Mysterae
New member
Either layout works, pick the one that suits your tube placement best.
Are you purposefully designing your loop to be in parallel? I'd only go parallel where needs must, such as optimal tubing routing. In my next project I'll have four blocks in parallel but that's because of aesthetics and minimum pipework.
Are you purposefully designing your loop to be in parallel? I'd only go parallel where needs must, such as optimal tubing routing. In my next project I'll have four blocks in parallel but that's because of aesthetics and minimum pipework.
shambles1980
New member
Best advise is as little hose as possible - you dont want huge loops of hose hanging all out like a badly abused lady garden
I'd do the same. Just makes everything look much simpler and less to worry about.
shambles1980
New member
if you are thinking the temps will be higher in seriese vs parallel. or that because you dont have a rad between components, that is not really a factor.
the system will always get the water up to the same temp as dictated by the amount of rad space you have.
Where the rads are compared to your components makes next to no difference at all.
Possibly 1-2degrees here or there but at the end of a long gaming session the temps will be the same in a series loop or parallel.
If you had 3 rads it makes no diference if you go
Res>rad>cpu>rad>gpu>rad>gpu
Vs
res cpu>gpu>gpu>rad>rad>rad
or
res>rad>cpu>gpu>rad>rad>gpu
at the end of the gaming session the water temp will be the same and the components will be at the same temps.
it all just equalizes
the system will always get the water up to the same temp as dictated by the amount of rad space you have.
Where the rads are compared to your components makes next to no difference at all.
Possibly 1-2degrees here or there but at the end of a long gaming session the temps will be the same in a series loop or parallel.
If you had 3 rads it makes no diference if you go
Res>rad>cpu>rad>gpu>rad>gpu
Vs
res cpu>gpu>gpu>rad>rad>rad
or
res>rad>cpu>gpu>rad>rad>gpu
at the end of the gaming session the water temp will be the same and the components will be at the same temps.
it all just equalizes
I'm curious about the flow rate at the CPU block. Will it be less than what the CPU block restriction would allow for?
Should it be the case, wouldn't the CPU block cooling capacity be underutilized?
I'm just interested in any benefits a parallel setup could bring, but if a serial one will be just as efficient and let me get away with less tubing, it's meh.
Mysterae
New member
I know you are curious but you're at the verge of over-thinking it. With your 2x D5 pumps any restriction will be overcome. In fact you'll probably end up adjusting the pumps to a about half the speed of one 
.
I've done a few parallel setups in the past, the first one had 6 blocks of various shapes. I even had valves to control the flow to each block (look at the reservoir in my avatar). It didn't matter, they all achieved their optimum flow rate given the initial flow rate of the pump.
In the system I've just stripped down both GPUs were in parallel and they coped very well. My next system will have 4 blocks in parallel powered with one D5 and I'm not worried about any blocks not getting their share of the flow.
.I've done a few parallel setups in the past, the first one had 6 blocks of various shapes. I even had valves to control the flow to each block (look at the reservoir in my avatar
). It didn't matter, they all achieved their optimum flow rate given the initial flow rate of the pump.In the system I've just stripped down both GPUs were in parallel and they coped very well. My next system will have 4 blocks in parallel powered with one D5 and I'm not worried about any blocks not getting their share of the flow.
Asperatis
New member
A single d5 pump will be more than plenty too. I'm running 2x 480 60mm rads, cpu block and two gpu blocks in parallel with one d5 pump.
My flow speed is set to 2/5 too. Water temps after a long gaming session never exceed 44 degrees, and that's with my fans spinning at only 450ish rpm.
Long story short: 1 d5 is plenty and you needn't worry about any block restriction whatsoever
My flow speed is set to 2/5 too. Water temps after a long gaming session never exceed 44 degrees, and that's with my fans spinning at only 450ish rpm.
Long story short: 1 d5 is plenty and you needn't worry about any block restriction whatsoever
Yeah, I guess. Just want to make my experience interesting and don't want to make the system underpowered or "just what it needs to run". Better to have more of everything than not having it for the future.
I assume two pumps in series also gets me redundancy and allow for lower pump speeds to combat noise? I also wanted to go with 140 slim rads with a low fpi count (9-12) to be able to run at low rpm's but it was just too much headache with my case as well as fan selection.
I bought these 16FPI 480 HWLabs LS series directly from Performance PC's in Florida as I can't seem to find any proper supply of HWLabs stuff in europe since they fell out with their european distributor.
The routing of tubing in my design examples are purely schematic and all the "abused lady gardens" will be hidden away to the best abilities of my case (Enthoo Primo).
