I ran 45-50C for a while. It got algae and gunk after some time, the softtubing got discolored but unless your coolant fails it should not be a issue.

40+ is only really not good if you use hard tubing of the melting plastic kind.

 

can't say anything about leaks in tubing/fittings but pumps:

my ambient is 34c right now i will be hitting 40c+ while gaming w/o a worry. hosing get a little soft but no leaks. (simple compression fittings and soft [corsair for a try ] tubing)

 

Get a temp sensor for the aio or loop. Dont trust the mobo sensors. Usually they're off by a few but you LL be fine. As long as your fittings are the right size and if you have soft tube just make sure that they aren't twisted weird. On custom loops you think it's on then when you start to tighten the collars they get twisted and creates wrinkles. Aios have actually really thick tubes and can handle slight abuse. Hard tubes you just need to make sure the bends are have a few length before you put a fitting or if you need that bend just use a 90 fitting.

 

I'm running EK Quantum block, EK rads. The fittings are a mix of Bitspower, and Koolance Quick disconnects. Think there might be an EK fitting thrown in the mix too. Tubes are PrimoChill.

I started running Nicehash through my 3990x, and pretty much pegged most cores to 80c. The water quickly got up to 40c, and stayed there. I should probably play around with the pump and fan curve to see if I can pull that down. Maybe, even try remounting for improved temps.

Does anyone know if 40c water is dangerous for the loop leaking?

Oh what you might not be taking into account too tho is that it's probably running much cooler than that. Because the water actualy travels quick and most temp sesors can't even pick up that dissapation. Your cpu will overheat way before you'll blow fittigs or get leaks caused by heat expansion. Once a system is pressurized unless the fittings are really loose you should be ok.

 

Another reason why I use Norprene tubing. Good to 135c so it never feels soft or causes leaks due to heat. If you like the matte black look that is.

 

It's a nice look. Almost like car brake hoses or soft hard tubing. PMMA/Acrylic is apparently 160C once it melts? It took 370C on the heat gun for me to get the tubing pliable.

Though, I don't know what PETG feels like and is to work with.

 

There’s nothing wrong with 40C water except that since your CPU temp is going to be some offset from the water temp for a given load the higher the water temp the higher your CPU temp will be. I know you were wanting to figure out how high of an OC you could run keeping cores under 80 C and not you know because you’re hitting that. With another or better radiator or better airflow you could cut the water temp a bit and buy yourself a little more headroom. That’s all, though, and if you want to run it with 40C water it’s fine.

 

What’s your delta? 40c is mostly meaningless if we don’t know your delta.

 

For the question it’s perfectly meaningful: what water temp is a problem for the loop components: liquid, pump, hose, fittings, blocks and rads.

Delta is interesting for the effectiveness of the loop and troubleshooting perhaps…

 

I just bumped the fan curve up a ton, and now water is around 34c tops. Think I'll try remounting the cpu block if I run into problems with more tuning. I really don't want to take the entire computer apart to fix the monoblock.

 

My loop regularly runs over 40C during summer when I don't bother to use the Air-con. On a nice 30C+ day its pretty hard to avoid having the water go over 40C
Been running fine for years.

 

 

All Darren9 was saying here is that the loop itself is going to be the same temp as the water in it, or thereabouts, which--if the loop has flow--is a given. It's certainly not going to be meaningfully hotter than the water at any point other than a tiny hotspot on the blocks directly over a GPU/CPU. So, if the weakest link in the loop can handle nC, and the water never reaches that point, the loop is not going to fail or leak because of temperatures, even if it's performance is utterly abysmal, no matter what the ambient temps are (if they were too hot for the loop itself, that would automatically be reflected in coolant temp).

Darren9 almost certainly knows what a temperature delta is. He's probably confused by your statements for the same reason I am; they are out of context. You seem to be talking about cooling performance. This is not what the OP was talking about. Knowing temp deltas (ambient to water, component to water, component to ambient, whatever) do not contribute to the answer for any question the OP had. They might reveal other facts about the loop that the OP should be concerned about, but they say utterly nothing about the sole, specific, question asked.

 

Let me put it more simply. The equipment is rated for 50c. Your delta is 10c. Is it safe? Who knows. Your equipment is rated at 50c. Your water is 60c. Is it safe? No. You don't need the delta to tell you 60c exceeds 50c. It can be excluded in a certain context.

Again context matters.

 

The potential breeding ground long term for algae. It loves warm waters.

 

Yeah, I think it's probably fine. I did tune my fan speed up as the cpu was running much hotter than needed. Brought the water temp down to 32 to 35 C.