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Liquid Cooling Intel RTS2011LC

  1. #1

    Liquid Cooling Intel RTS2011LC


    I bought one of these Intel CPU coolers about 3 years ago, RTS2011LC for my Asus P7P55 Mobo. At the time it was quite an improvement on air cooling (Hyper 212) when overclocking.

    I later upgraded to the ASUS P8Z77V-De Luxe and fitted the cooler to that machine.

    My PC is usually running 24/7, and with a moderate O/C 4-4.2GHz.

    Now recently, (last 3 months) I had noticed that the CPU fan was getting louder and louder and first assumed it must some garbage running in the background. After checking and running the usual Malwarebytes Win Defender Etc. I found no problems.

    It was at this point i checked the CPU temps and this is where it starts to get interesting; ASUS Suite, reports the CPU temperature at about 65C, which is about 15 degrees higher than I would have expected given what was running. I then checked Real Temp and it showed almost 78C with the same load (not more than 20%)

    I then decided to re run Prime 95 as i had a good idea what sort of temps. I used to get before (85C or so)

    When I ran Prime, ASUS reports 84C and holding steady, OK I thought until I checked Real Temp - It was showing 105C on all 4 cores and the CPU was throttling back to 3.2 GHz!

    After fiddling around for a while disconnecting various fans on the MB it appeared that the CPU fan on the Intel radiator made no difference to the temperatures whether on or off - the coolant pipes were as expected, on hot and one cold.

    I checked the temperature of the fan output and it was cool rather than noticeably warm as it used to be.

    Well, today I removed the cooler and there was barely a drop of liquid in the darn thing, it was just pumping air.

    I understood these things were supposed to be good for at least 5 years and maintenance free, obviously not in thi case.

    I dunked the entire system into a tub of hot water to pressurize it to see if there were any leeks, nothing to be found!

    It would appear that the liquid must have somehow evaporated.

    So if any of you are running the Intel cooler for an extended period and your CPU temps start rising gradually at first, it might be worth checking out.

    I am going to drill a hole in the Rad and see if I can top it up, maybe fit a small refillable header etc. (as an experiment)

    I bough the new Corsair H100i today and chopped a few chunks out of my case and managed to get it running - 4.2GHz and 39C - boy this beast knocks the spots off the Intel. (75C @ 4.2GHz on Prime 95, all stock voltages)

    Hope this might prove helpful to someone in the future - Also, keep an eye on ASUS temperature monitoring from AI Suite, it never rose above 84C despite the core temps being 105C, not a good feeling with that as a safety net.

      My System SpecsSystem Spec

  2. #2


    Wow! This is good to know as I have the same Intel branded Asetek cooler on my i7-3770k, overclocked to 4.6GHz. My temps have been consistent over the past 18 months but I'll continue to monitor them closely. Thanks for letting us know about this!
      My System SpecsSystem Spec

  3. #3


    You are more than welcome! The good thing is that despite there being no liquid circulating (or very little) The machine does not burn itself up but will idle around 50-60C. (I was in hospital over the weekend and it had been left on).
      My System SpecsSystem Spec

  4. #4


    I know the CPU's will shutdown after a critical temperature is reached, so no danger of "burning up" a CPU, but the fact that the cooling liquid (polyethylene glycol, I believe) was "lost" or evaporated disturbs me as I was hoping these closed loop systems would last 5 years or longer.
      My System SpecsSystem Spec

  5. #5


    I was certainly hoping for a lot longer life than I got, I am not sure if it is relevant or not but where I am my ambient room temperatures are between about 30C and 37C during the day and only drop to low twenties during the nights in winter, no air con only fans - it might be partially due to this that the coolant has evaporated.

    Like I said in the original post, I dunk tested the entire Intel system in hot (65C) water bath to try to find if it was due to a leak but I found nothing. I also was a regular case opener and am sure I would have noticed any fluids if it had been any sort of major 1 off leak. Again, the temperatures gradually rose over about a 3 month period, so it sort of crept up on me.

    I liked the Intel cooler, it was quiet and reasonable for my O/C, however it cannot begin to compare with this new Corsair H100i that I picked up yesterday, totally different ball game altogether, it has me itching to start cranking up the motherboard speeds!

    It is also the only time I have ever seen my CPU temperature cooler than my motherboard temps!

    I don't know what software you use for monitoring temps. but be very wary of ASUS AI Suite, it was topping out at 84C and never rose above that, it was only when I compared it with Real Temp that I discovered there was about a 10C difference (I believe AI measures Tcase and Real Temp measures Tcore) all of the time between the two programs, however once the coolant stopped cooling, AI stayed at 84C while RT was showing 105C on all 4 cores and checking CPUZ showed that the CPU was throttling down to about 3 GHz.
      My System SpecsSystem Spec

  6. #6


    Wynnum Australia
    Posts : 466
    Windows-10-Pro-Build-11099.rs1-x64


    Just as some additional info:

    Liquid Cooling System Maintenance

    Why you should avoid "closed loop" water cooling

    Intel’s liquid CPU cooler: Is water worth the cost?


    Beside that, I have to top-up at least every 6 month my custom-loops, which use better parts than a closed-loop and no one would run a liquid-cooling-system for 5 years without changing the coolant and / or flushing the whole loop.

      My System SpecsSystem Spec

  7. #7


    I'd love to have a go at doing my own liquid cooling system here, but unfortunately a lot of the kit is not easily available. If i had to import from US or Europe it can cost me as much as 300% import duties.
      My System SpecsSystem Spec

  8. #8


    Wynnum Australia
    Posts : 466
    Windows-10-Pro-Build-11099.rs1-x64


    Quote Originally Posted by Miggins View Post
    I'd love to have a go at doing my own liquid cooling system here, but unfortunately a lot of the kit is not easily available. If i had to import from US or Europe it can cost me as much as 300% import duties.
    That is my kit: Click

    Maybe have a look around and maybe you can find something in your price-range: Click

    Here is another shop in the UK: Click

    ... and another one: Click

    But be careful, because the radiators of custom-loops are much thicker than the cheap closed-loop ones !

    Don't be afraid, as the kit's are not too hard to put together.

    I would not recommend to put a kit together yourself for the first time, because you would have to do some reading first, as not everything would fit or work together, like different tubing sizes / fittings etc.pp.


    Edit: I just saw, that you have the UK-Flag's, but also Thailand in your profile. Where do you live ?

    Edit-2: Maybe that offer here would be an option: Click

      My System SpecsSystem Spec

  9. #9


    Thanks for the links! Some nice kit you have there!
    I am in Northern Thailand, that is why we get hammered on import duties. I am going to have a go at making my own cooling system one day, doesn't scare me, my work involves a lot of hi tech, hi volume electronic manufacturing with a lot of custom production equipment - However, the work is in Shanghai where you can get almost anything, not like Northern Thailand.

    I have a few projects in mind, I am going to de lid my i7-3770K and remove the Intel thermal paste and take it into work where we can make up an 8 thou solder stencil and try putting the heat spreader through our reflow oven and see if we can solder the heatspreader back on to see if we can improve the conductivity. (we have some pretty smart reflow engineers here!).

    As I said in an earlier post I am going to drill out the Intel Rad to see if I can fit a header tank and use it as an out of case experimental cooler - If that doesn't work I have a huge old Toyota Tiger Diesel radiator that holds about 20 litres that could come in handy, ha ha.
      My System SpecsSystem Spec

  10. #10


    Wynnum Australia
    Posts : 466
    Windows-10-Pro-Build-11099.rs1-x64


    Quote Originally Posted by Miggins View Post
    Thanks for the links! Some nice kit you have there!
    I am in Northern Thailand, that is why we get hammered on import duties. I am going to have a go at making my own cooling system one day, doesn't scare me, my work involves a lot of hi tech, hi volume electronic manufacturing with a lot of custom production equipment - However, the work is in Shanghai where you can get almost anything, not like Northern Thailand.

    I have a few projects in mind, I am going to de lid my i7-3770K and remove the Intel thermal paste and take it into work where we can make up an 8 thou solder stencil and try putting the heat spreader through our reflow oven and see if we can solder the heatspreader back on to see if we can improve the conductivity. (we have some pretty smart reflow engineers here!).

    As I said in an earlier post I am going to drill out the Intel Rad to see if I can fit a header tank and use it as an out of case experimental cooler - If that doesn't work I have a huge old Toyota Tiger Diesel radiator that holds about 20 litres that could come in handy, ha ha.
    Sounds awesome to me !

    I know a guy which uses a Toyota Hilux Radiator for his loop. A car radiator would be maybe easier to get in your area or a fridge-compressor.

      My System SpecsSystem Spec

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Liquid Cooling Intel RTS2011LC
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