In a worst case scenario, water temp will be 20° c above ambient. But if that was the case you'd have very poor WC system. Typically Delta T is under 10°c. Under 5°c with an excellent cooling system, though 1°c Delta T under load is possible (but it's loud an expensive!).

 

The temperature at which a hose will start to deform is different depending on the hose. You didn't mention what tubing you're using, so I don't know what would be safe for your system. The manufacturer of your tubing should publish the operating temperature in the specifications.

 

The temps a which hose starts to "soften" can be as low as 50°C , and most will definitely go "limp" between 60°C-70°C
For straight vertical runs, you have more "breathing room". For bends or horizontal runs, going over 50°C risks the hose "sagging".
Wall thickness plays a role also.. a 13 ID - 19 OD will arguably keep it shape somewhat longer as 13 ID - 16 OD or 10/13.

But you need to double check with manufacturer.
The specs for Tygon B-44-4X (a very good plasticiser-free hose) are Max temp 74°C , Min temp -36°C according to Saint-Gobains spec sheet
http://www.processsystems.saint-gobain.com/tygon-s3-b444x-tubing.aspx
But you have to dig somewhat deeper to find out more detailed info/specs related to wall thickness & such

Note: Some vendors/(web)shops actually list the important specs.
Like AT does for this Koolance Silver hose (between -20°C and +60°C)
http://www.aquatuning.de/water-cooling/tubing/tubes/8809/koolance-tubing-16/13mm-1/2-id-silver?c=601
others don't

But the truth information is out there (plays x-files theme tune)

However, the most important tidbit is to keep loop temps well below those max numbers... definitely below 50°C and preferably below 40°C (below 30°C if possible), because hoses are not the only things affected by higher temps.
Pumps have a min-max range also... and (rubber) O-rings tend to have an even smaller range as hose.
The popular D5, also exists in HVAC Circulation Pump version, but in that incarnation the rubber O-ring is replaced by something else maybe teflon or something space-age

 

Quote:

Originally Posted by RnRollie

The temps a which hose starts to "soften" can be as low as 50°C , and most will definitely go "limp" between 60°C-70°C
For straight vertical runs, you have more "breathing room". For bends or horizontal runs, going over 50°C risks the hose "sagging".
Wall thickness plays a role also.. a 13 ID - 19 OD will arguably keep it shape somewhat longer as 13 ID - 16 OD or 10/13.

But you need to double check with manufacturer.
The specs for Tygon B-44-4X (a very good plasticiser-free hose) are Max temp 74°C , Min temp -36°C according to Saint-Gobains spec sheet
http://www.processsystems.saint-gobain.com/tygon-s3-b444x-tubing.aspx
But you have to dig somewhat deeper to find out more detailed info/specs related to wall thickness & such

Note: Some vendors/(web)shops actually list the important specs.
Like AT does for this Koolance Silver hose (between -20°C and +60°C)
http://www.aquatuning.de/water-cooling/tubing/tubes/8809/koolance-tubing-16/13mm-1/2-id-silver?c=601
others don't

But the truth information is out there (plays x-files theme tune)

However, the most important tidbit is to keep loop temps well below those max numbers... definitely below 50°C and preferably below 40°C (below 30°C if possible), because hoses are not the only things affected by higher temps.
Pumps have a min-max range also... and (rubber) O-rings tend to have an even smaller range as hose.
The popular D5, also exists in HVAC Circulation Pump version, but in that incarnation the rubber O-ring is replaced by something else maybe teflon or something space-age

Ok thanks for your feedback. While benching firestrike, according to hwmonitor my i maxed out a 40c but generally stayed around 32-35c. I am currently at 4.62GHz on 1.47v. The temp according to msi command center is a bit lower, maxing out at around 35 but staying around 30c. While stressing in cpuz the temp i am sitting around is 45c, and thats the highest ive seen ever on this oc. Command center is still telling me around 30c, so im jsut not going to stick with that and stay with hwmonitor. But I think these temps are fine, as 40c would be the highest i would see in games, and possibly lower. I am using Alphacool Tubing AlphaTube HF 13/10 (3/8"ID) which can be found here: http://www.performance-pcs.com/alphacool-tubing-alphatube-hf-13-10-3-8-id-clear-3m-retailbox.html

 

Alphatube .. clear PVC .. range -20°C to +60°C

It might not be a bad idea to open up your CPU block and check for plasticiser flakes/grains in a few months time, when the hoses go cloudy and its time for maintenance.

It's also the moment to drop the hoses and go for something hi-end like Tygon, or the "new" EK or the Advanced LRT .. or just source Med/food-grade hose from somewhere.

Now that you're into W/C ... you have found a new money sink

Best of luck

 

My Koolance controller alarms at 35c and performs a shutdown at 40c. I've never heard the alarm. It's come close though. The highest I've seen my water temp is 34.7c. I use PETG and have a 5960x running at 4.5Ghz (1.31v) and two 980 Ti Hydro Coppers.

My rad fans (14 of them) run at 25% at 25c, 60% at 32c and 100% at 40c.

I think you are good to go.

 

The temp of the cpu will always be much higher than coolant temp at load and there is no real maximum aside from OC and damage limits.
Energy put into the coolant is what raises it's temp but energy and temp are not absolutely linked. A cpu with poor water block contact or bad TIM can have a very high temp but low energy output and vice versa.

Really, a CPU can never get hot enough to cause problems with the loop unless there is no cooling or near zero flow.

 

Quote:

Originally Posted by Jakusonfire

The temp of the cpu will always be much higher than coolant temp at load and there is no real maximum aside from OC and damage limits.
Energy put into the coolant is what raises it's temp but energy and temp are not absolutely linked. A cpu with poor water block contact or bad TIM can have a very high temp but low energy output and vice versa.

Really, a CPU can never get hot enough to cause problems with the loop unless there is no cooling or near zero flow.

Bios of my new ud3p disabled fan of the 120mm rad on a stock fx 8300 with 1.4v ( bios was gone crazy )

At idle i had 60celsius on the radiator and almost burned my finger. cpu was at 65c

So i can safely say that without fan it can boil and blow everything

 

Quote:

Originally Posted by bonami2

Bios of my new ud3p disabled fan of the 120mm rad on a stock fx 8300 with 1.4v ( bios was gone crazy )

At idle i had 60celsius on the radiator and almost burned my finger. cpu was at 65c

So i can safely say that without fan it can boil and blow everything

Which would be no cooling and not the fault of the CPU temp.

 

Quote:

Originally Posted by Jakusonfire

Which would be no cooling and not the fault of the CPU temp.

Yea well if you put 3 big gpu into a 240mm rad it may blow

 

Quote:

Originally Posted by bonami2

Yea well if you put 3 big gpu into a 240mm rad it may blow

Yes, but that is lots of wattage which would cause high coolant temps, not the temp of the cores.

The point is simply that temperature and wattage are not the same thing. The OP was asking about CPU/core temps affecting coolant temp.

Air cooled, GPU temps are normally higher than CPU temps while water cooled, the reverse is true. Temp is variable depending on thermal transfer efficiency so we can't say for example; A 90C core temp will give 60C coolant temp. In the same way we can't say X core temp is safe but y core temp is not.