watercooling Single or Dual Loop Cooling System?

[csokifagyi000]

Hi Guys!

I'm planning to buy a new PC and i want to build a water cooling system in it.

 

I don't know witch one is the better option:

a, One Loop System: CPU GPU 2x480mm radiators and another 360mm rad.

          I'm afraid of that one pump won't be able to handle all 3 rads. 

b, Two Loops System: CPU and a 360mm rad - GPU and 2x480mm rads.

          I also afraid of thet is I put CPU and GPU in one loop, then the second block will get warm water instead of cool fresh from the rads.

 

Witch one is better choice?

Witch of my fears is true?

Witch brand have the best cooling staff (pump, reservoir, rad, etc.)?

Witch is better, pump and reservoir or two in one pump & reservoir?

 

Planned PC Specs:

Corsair Series Obsidian 1000D

RTX 2080 ti

i7-9700k

Some Thermaltake Cooling Staff

 

 

[TheKDub]

You could always do res -> pump -> rad -> CPU -> rad -> GPU-> rad -> res
That'd be a neat configuration for it. (or some other configuration with a rad between the CPU and GPU in the loop. I'm no loop configuration expert.)

 

I really wouldn't worry much about having both the CPU and GPU in the same loop. If you did two loops, you'd need two reservoirs and two pumps, so keep that in mind. (More vibration from pumps, more space taken up, etc..)

[TheNaitsyrk]

36 minutes ago, csokifagyi000 said:

Hi Guys!

I'm planning to buy a new PC and i want to build a water cooling system in it.

 

I don't know witch one is the better option:

a, One Loop System: CPU GPU 2x480mm radiators and another 360mm rad.

          I'm afraid of that one pump won't be able to handle all 3 rads. 

b, Two Loops System: CPU and a 360mm rad - GPU and 2x480mm rads.

          I also afraid of thet is I put CPU and GPU in one loop, then the second block will get warm water instead of cool fresh from the rads.

 

Witch one is better choice?

Witch of my fears is true?

Witch brand have the best cooling staff (pump, reservoir, rad, etc.)?

Witch is better, pump and reservoir or two in one pump & reservoir?

 

Planned PC Specs:

Corsair Series Obsidian 1000D

RTX 2080 ti

i7-9700k

Some Thermaltake Cooling Staff

 

 

I have all my things in the same loop. GPUs don't go past 48C during load. (specs in sig)

[Mick Naughty]

If you are gonna go through the trouble of a dual loop, might as well either do it or put two pumps on a single loop. 

 

Dont see how warm fluid would effect the second block. That’s why the radiators are there. Dual is easier to maintain but gonna cost more in each way. I’d do it if you have the room for it. Or keep it simple and do a single loop and hope it can look better. 

[MaratM]

2x480+360 what are you cooling? A nuclear reactor?

It is a massive case and you need to feel it up with something, however you are not running a 500watts cpu like a 32 core threadripper or 9980xe nor multi GPU setup.

one d5 pump is enough for you loop. You better off to invest in something like aquaero or commander pro to control your fans and pump.

[B4Quattro]

Quote

2x480+360 what are you cooling? A nuclear reactor?

If you have more radiator capacity you can run your fans with a lower rpm and the system is quieter.

I would recommend connecting  all components in one loop.

[jasonvp]

On 6/29/2019 at 8:00 AM, Mick Naughty said:

Dont see how warm fluid would effect the second block. That’s why the radiators are there.

It's exactly what happened from my experience: During graphically-intensive games where the CPU was barely being used the GPUs (always SLI...) would warm up and hit their steady-state temperature.  The CPU would as well, and get to nearly the same temperature.

 

Likewise, if I was running a CPU-intensive job where the GPUs weren't being used much, they'd get warmed up by the water coming off the CPU.  It didn't really seem to matter how I ordered the components, even with wedging a radiator or two between them.  It really seemed like the three chips were looking for a temperature equilibrium.

 

When I moved to two independent loops with two pump/res combos, that "equilibrium" stopped.  The GPUs' temps increased independently of the CPU's, and vice versa.  As you point out, a two-loop setup is far more flexible than a single loop.  It becomes more so when you consider maintenance, changing parts out, adding/removing GPUs or CPUs, etc.  One real simple "for instance" - When I purchased my new GPUs it was prior to EK releasing the blocks for them (thankfully, it wasn't too long).  But because I had a single loop in the system, I couldn't really swap the GPUs out without completely re-working the tubing in the system.  But if I'd had a double-loop at the time, I could have pulled the old GPUs out, disconnected the pump from the electrical system, and temporarily used the new GPUs on air.

 

It's that sort of flexibility that has convinced me to keep with double loops from now on.  Also, to someone else's point: there's no such thing as "too much radiator".  More surface area means more fans, and more fans means ssllllooowwwwerrrrr fans.  Which means quiet .. sshh shhh  QUIET!! fans.

 

[Lathlaer]

On 6/28/2019 at 11:46 PM, csokifagyi000 said:

I'm afraid of that one pump won't be able to handle all 3 rads. 

The rads are not the most resistant, the waterblocks are. In any case, a single D5 pump will go through that setup without much problems.

 

On 6/28/2019 at 11:46 PM, csokifagyi000 said:

  I also afraid of thet is I put CPU and GPU in one loop, then the second block will get warm water instead of cool fresh from the rads.

The way LC cooling works, in a loop like this, the temp will more or less equalize and the order will not matter.

 

When is it good to go for double loop?

 

1. You have a huge case (like the biggest Corsair or Caselabs cases) and don't know what to do with spare space

2. You rutinely put a 100% load on your CPU AND GPU's

 

In other instances it's better to go for single loop (for instance, in gaming you typically use between 20-30% of your CPU and 90+% of your GPU so doing a double loop will actually waste cooling performance of the rads from the CPU loop which could've been used by the GPU).

 

In your specific case, I'd go for double loop simply because Obsidian 1000D is a monster of a case and it will look nice.

 

Also, with a single GPU and a single CPU mainstream, going for a total of 1320mm of rad capacity will hit a wall of diminishing returns HARD. With that much cooling capacity, basically do what you want and what looks nice. 

[Mick Naughty]

59 minutes ago, jasonvp said:

It's exactly what happened from my experience: During graphically-intensive games where the CPU was barely being used the GPUs (always SLI...) would warm up and hit their steady-state temperature.  The CPU would as well, and get to nearly the same temperature.

 

Likewise, if I was running a CPU-intensive job where the GPUs weren't being used much, they'd get warmed up by the water coming off the CPU.  It didn't really seem to matter how I ordered the components, even with wedging a radiator or two between them.  It really seemed like the three chips were looking for a temperature equilibrium.

 

When I moved to two independent loops with two pump/res combos, that "equilibrium" stopped.  The GPUs' temps increased independently of the CPU's, and vice versa.  As you point out, a two-loop setup is far more flexible than a single loop.  It becomes more so when you consider maintenance, changing parts out, adding/removing GPUs or CPUs, etc.  One real simple "for instance" - When I purchased my new GPUs it was prior to EK releasing the blocks for them (thankfully, it wasn't too long).  But because I had a single loop in the system, I couldn't really swap the GPUs out without completely re-working the tubing in the system.  But if I'd had a double-loop at the time, I could have pulled the old GPUs out, disconnected the pump from the electrical system, and temporarily used the new GPUs on air.

 

It's that sort of flexibility that has convinced me to keep with double loops from now on.  Also, to someone else's point: there's no such thing as "too much radiator".  More surface area means more fans, and more fans means ssllllooowwwwerrrrr fans.  Which means quiet .. sshh shhh  QUIET!! fans.

 

Don't see why it would matter at all. So the temps would go up a bit? Doesn't effect anything at all unless you have bad fan profiles. Better cooling and better profiles eliminate that kind of issue. Having one loop with a silent profile is the same as having two loops with the same profile. Unless you need to see unused devices at their idle temps all the time, somehow making the idle devices perform better.

 

But yea, if you wonna service half the system for that sure. I would do that too if I had the room to cool my stuff on two loops. Perfect for that reason and that one alone.