For months, while reading all of these posts about the Hydro Series having this problem or that, everything was running fine here; two H80i's and one H100i. (Grinding fans notwithstanding—I'll deal with that when things get sorted out on Corsair's end.) Yesterday, however, I came back into the studio and noted that the 650D case fans were on max, as if the system were under load. Checking, nothing is tasking the system and it should have even gone to sleep by this time. Looking at the temps, the CPU cores are at 59C; at idle. The other two systems are happily idling at 35C. Hmmm.
Checked the tubes and the lower one was warm. Upper was cool. Only warm section of the radiator is where the tubes attach. The rest of it is cool. Over time, the temps on the 3930k rose to 70C, then 75C. Tried maneuvering the case in different orientations to expel air perhaps trapped in the water block; causing cavitation and flow loss. No joy. Shut it down.
Upon reboot, after having let it sit to cool, the temp protection alarm triggered, preventing boot, and required an F1 to get into the BIOS monitor. Once in, the CPU is at 71C and rising. Once it got to 80C, after about ten minutes, I shut it down again.
Nest day I removed the unit to replace the stock TIM with Arctic 5, using the methods recommended by Arctic Silver; as I always do—figuring that this was a good first debugging step, as the symptoms indicated that, among other things, perhaps the TIM contact had failed.
Upon inspection, I see that the "shrouds", for lack of a better term, that cap the ends of the two tubes at each end have cracked and separated. I presume that these are to secure the tubes onto the hose barbs, much in the function of shrink tubing. Removed all four of them, because they were useless; replicating that function with narrow width tie-wraps applied at the valley between each barb; three on each connection. There is no evidence of leakage but, with the shrouds having failed, perhaps air has entered the system. Tipping and gently oscillating the H100i does not produce any liquid sound. The question does arise, as it is a possible cause of that which has been observed, below.
Once the TIM cleaning and replacement was complete and the unit returned to the 650D, I booted it up; hopeful to see a 39C idle. No joy. Started at 59C and slowly rose to 71C; same as before.
Observations:
Indications are that coolant flow is impeded. When it gets to the radiator, the energy is bled off but doesn't get back down to the water block fast enough.
This leads me to conclude:
ALL of these would result in elevated pump RPM and slow heat soak in the output tube. Because no work is being performed moving the liquid, whether the system is full or not, it's operating in partial convective mode; barely keeping the CPU from frying completely.
Not happy. This is my main workstation and I'm down until this gets replaced.
Checked the tubes and the lower one was warm. Upper was cool. Only warm section of the radiator is where the tubes attach. The rest of it is cool. Over time, the temps on the 3930k rose to 70C, then 75C. Tried maneuvering the case in different orientations to expel air perhaps trapped in the water block; causing cavitation and flow loss. No joy. Shut it down.
Upon reboot, after having let it sit to cool, the temp protection alarm triggered, preventing boot, and required an F1 to get into the BIOS monitor. Once in, the CPU is at 71C and rising. Once it got to 80C, after about ten minutes, I shut it down again.
Nest day I removed the unit to replace the stock TIM with Arctic 5, using the methods recommended by Arctic Silver; as I always do—figuring that this was a good first debugging step, as the symptoms indicated that, among other things, perhaps the TIM contact had failed.
Upon inspection, I see that the "shrouds", for lack of a better term, that cap the ends of the two tubes at each end have cracked and separated. I presume that these are to secure the tubes onto the hose barbs, much in the function of shrink tubing. Removed all four of them, because they were useless; replicating that function with narrow width tie-wraps applied at the valley between each barb; three on each connection. There is no evidence of leakage but, with the shrouds having failed, perhaps air has entered the system. Tipping and gently oscillating the H100i does not produce any liquid sound. The question does arise, as it is a possible cause of that which has been observed, below.
Once the TIM cleaning and replacement was complete and the unit returned to the 650D, I booted it up; hopeful to see a 39C idle. No joy. Started at 59C and slowly rose to 71C; same as before.
Observations:
- Pump RPM is a bit high at 2,390.
- CPU temperature slowly rises, doesn't spike.
- Lower tube (output from water block) slowly becomes very hot; advancing along its length.
- Upper tube (input to water block) remains cool.
- Radiator away from tank and tube connections is cool.
Indications are that coolant flow is impeded. When it gets to the radiator, the energy is bled off but doesn't get back down to the water block fast enough.
This leads me to conclude:
- The impeller has become disassociated from the drive shaft.
- There is a blockage of some sort in one of the tubes.
- Coolant volume no longer fills the system to the recommended level.
ALL of these would result in elevated pump RPM and slow heat soak in the output tube. Because no work is being performed moving the liquid, whether the system is full or not, it's operating in partial convective mode; barely keeping the CPU from frying completely.
Not happy. This is my main workstation and I'm down until this gets replaced.
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