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Watercooling Diminishing Returns (on your $$$)

post #1 of 13
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I am finally getting around to starting a watercooling rig which is in a Rosewill legacy U3 case to have a 140 RAD with push and a 120 RAD with push/pull. I was questioning whether this would be enough for an overclocked i5 around 4.5Ghz and an overclocked GTX 970. Whether I would get good temps for the amount of radiator space I was to put in.

I was then wondering whether a plateau is reached on temps after a certain amount of rad space is achieved for varying setups with a logical amount of corresponding rad space. There are a lot of factors that go into temperatures but assuming ideal conditions is there a general rule of thumb to achieve the most efficient amount of rad space?
 
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post #2 of 13
There really isn't a rule on what is needed for watercooling. It depends a lot on how much fan noise your willing to live with.

I prefer a by the numbers approach and a quiet system. So I read a lot of rad/block reviews on xtremerigs to get an idea of what I need to efficiently cool my system.
Some prefer the 120mm per item being cooled plus an additional 120mm method.
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post #3 of 13
There is some mathematical formula or two kicking around if you do a search on OCN.

If your case allows and my choices on future builds will be at least one 360mm Rad per item being water-cooled.
 
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post #4 of 13
The general rule of thumb is 240mm of rad space per device with an extra 120mm for fudge room. This varies depending on lots of factors as you know. Unless you have low ambient temperatures and high enough flow on your fans, you will likely see high temperatures with the current setup. My bet is you are going to need another rad.
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post #5 of 13
all I can provide you is the information I have on my own rigs I have 3 water cooled units and all of the have more radiator space than you are suggesting.

house temps are right around 28C for most of the year,

this is a earlier build I did it has 2 radiators in parallel with each other, it has 2 X 240mm radiators, it has a CPU and GPU in series with each other, but the CPU and GPU water blocks are older blocks, with a open high flow design, so the flow rate on this system is 6LPM.
https://imageshack.com/i/04alldone003j
https://imageshack.com/i/joalldone006j

the load temps on this build are.
CPU 41C
GPU 51C
this system is a stock system with no clocks on the hardware

I did this build as a serial/parallel build it also has a flow rate of 6LPM, it has 1 X 360mm monstra radiator a CPU and GPU in parallel with each other, it looks nice, a lot went into making it look nice.
https://imageshack.com/i/0vfi2nJ
https://imageshack.com/i/exwiFW7Vj
https://imageshack.com/i/ezPiu5JIj

the load temps on this build are
CPU 48C
GPU 53C
https://imageshack.com/i/npuzs7j
not as good on temps as the older build, but also there is not as much radiator space on this build.
this system is also a stock system no clocks on the hardware

and the final build is my gaming rig, it has 2 X 360mm radiators in parallel with each other, and a CPU and 2 X GPU's in parallel with each other on a 3-way parallel configuration, this system is clocked, the CPU is at 4Ghz, the GPU's are at 580Mhz, and the memory is at 1600Mhz.






the load temps of the hardware are
CPU - 54C
GPU 1 - 45C
GPU 2 - 45C

the water temps at load are
33-34C
the delta t of the system at load is 4C
Link to Gallery
this system has a total flow rate of 9.6LPM
have a look at the total post
http://www.overclock.net/t/1573189/serial-vs-parallel-9-6lpm
if this system was stock with no clocks on any of the hardware, the load temps would be.
CPU - 35C
GPU1 - 37C
GPU2 - 37C
so I hope this helps with your rig, let me know please.
post #6 of 13
I have two 280x30mm rads with push/pull slow fans, and at ~500W I have a 10C delta-t. You would be looking at closer to 350W. I would recommend, if you wan't to overclock, a minimum of 360mm rad space with average fans. That being said, you may find the 120 and 140 is enough if your fans ramp up and have good static pressure.
post #7 of 13
The general rule of thumb is that OCN recommends way more radiator space than you actually need.

A 120 and a 140 will cool your setup. The temperatures might not be amazing, but they will be better than air. I used to run an i7 860 and a HD5850, both moderately overclocked, on two 120mm rads. It worked fine for gaming, however it did get a little toasty when running BOINC (full load on both the CPU and GPU), although even then temperatures were still acceptable (air-water dT of ~15°C).

If you add more rad space it will help, of course. If you have an existing system and you want to know what kind of benefit you could get from adding more rads, measure the ambient temperature and the water temperature. The difference is your possible room for improvement, although you will never get a practical system with a air-water dT of 0°C without active cooling.
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post #8 of 13
The best thing you can buy to work this sort of thing out is an in line temperature probe.

If your close to ambient then more rad won't help.

It's also worth remembering that low temperatures are not the most important thing. For me stable overclocking is the aim. No point in having lower Temps if you don't gain any performance.

At the moment I'm only running one 240 rad and that's plenty big enough.
However I'm going to build a new case soon that will have lots more rad space, the reason being that I managed to buy new 540mm rads for £25 which was the best value by far even though it's complete overkill.

I wouldn't buy anything till yyo know the water temperature with what you have, then add to it if you think there is a benefit from more rad.
post #9 of 13
I'd guess a 120 + 140 will be more enough for your setup, even with overclocking. Source: have ran an amd r9 290 on a single 120mm AIO cooler and that's way more power hungry than a 970. Throw in another rad on top of that and you should have plenty even with the i5 overclocked thumb.gif
post #10 of 13
In my journey through custom watercooling, I believe that you could get away with 1x120mm/140mm radiator per block plus another 1x120mm/140mm for overhead. I turned to water cooling for the reduction in noise. 2x240mm/45mm thick radiators plus 1000rpm fans = quiet 1440p gaming with components that never break 47c on full load.
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