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Heat Dissipation of Monsta Rad

post #1 of 9
Thread Starter 
I'm working on a design for a new rig and just wanted to check if I have my info correct. I'm only listing approximate values and not specific components where I don't feel the information is necessary. Please let me know if more information is required.

HEAT LOAD 300 - 350W

PUMP OUTPUT 4 - 5 PSI

==================================
PRESSURE DROP
RAD: 0.28 PSI * rough guess. I wasn't able to find the actual rating.
GPU: 0.50 PSI * again this is a guess. The block is the EK GTX680 DCU2
CPU: 0.70 PSI
HOSE + FITTINGS: 0.40 PSI * 1/4" ID hose with minimal 90 degree fittings over a short run < 2'
TOTAL 1.88 PSI

RAD SIZE 240 X 80MM
Alphacool NexXxoS Monsta Dual 120mm Radiator

What sort of CFM would be required to dissipate 300 - 350W with this rad. Can this rad handle the load? I have plenty of headroom with the pump my main concern is the radiator. I've chosen the 240 to try and keep my rig size down.

Thank you
post #2 of 9
You're going to want a minimum of 360 rad for CPU+GPU. The Montas 20mm of extra thickness will not be enough to compensate for additional 120mm in length. Technically It might be able to handle it with high performance fans, but the temps would be far from stellar.
post #3 of 9
It'll be fine but the temps won't be super delta.
post #4 of 9
I don't know if you intend to use the Monsta in push/pull. But you really should. If you intend to keep your fans running at low speed, the fans have a hard time pushing air through the thick rads at low speeds. Just check out Martin's chart here. The ST30 has the same design, fpi, and size as the UT60 yet it outperforms the UT60 at low speeds, even thougjt it is half as thick.

The reason why is because at low speeds, the fans can't build enought static pressure to push air through the thick rad but they can do just fine on a slim rad. So thicker rads will really benefit from push/pull, especially at low speeds.

Even if you have to go down one size to.the UT60 to accomodate push/pull, you will still get better results than a Monsta in push alone.

My guess is that if you only use a 240 rad, you will have to keep your fans at around 3000 rpm to keep your delta below 10 c. That's pretty noisy!

Cheers cheers.gif
Edited by PepeLapiu - 3/2/13 at 2:41pm
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Dark Vader
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post #5 of 9
Thread Starter 
I meant to include this in my original post but I was considering the 280 Monsta as an alternative. If I could get a delta of 10 what would I be looking at for CPU/GPU temps? Better than a top air cooler?
post #6 of 9
Quote:
Originally Posted by 0xDEAD View Post

I meant to include this in my original post but I was considering the 280 Monsta as an alternative. If I could get a delta of 10 what would I be looking at for CPU/GPU temps? Better than a top air cooler?
Yes but it depends on the blocks the delta is how much the water is above ambient temp
post #7 of 9
With a 240 or 280 you should get slightly better performance than top air cooling IMHO. If room in your case is an issue, you could always get one of these for an added 360 rad.
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post #8 of 9
Thread Starter 
Thank you for the quick replies. I guess what I'm aiming for is slightly better performance than good air cooling and I am basing my case design on what components I use so the smaller the better. I double checked the TDP on the CPU and GPU and it's actually closer to 270 at MAX load. I think I'm going to try for the 240 with some decent fans. I'm also looking at some hi static fans to create some positive pressure (+40 - 50 CFM) in the case with the radiator as the only exit, the case will be sealed. The pump I'm looking at also has a built in fan control so things should run nice and quiet for everyday use and hopefully wont be too loud under load. Thanks again.
post #9 of 9
If and when you get this rig going, could you post back with your results as far as temps and noise levels. I'd be interested to see more results from a monsta rad setup like this.
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Blood Red Merlin
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CoolingCoolingCoolingCooling
Alphacool UT60 480mm Koolance pmp-450 (with variable speed control) Bitspower mod kit (Acrylic Top, Black cover) EK-FC Titan Nickel/Plexi 
CoolingOSKeyboardPower
12 x Scythe Gentle Typhoon AP-15's Windows 7 Home Premium 64bit Logitech g15 Seasonic Platinum series 1000w 
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