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Maximizing watercooling performance with the NZXT H440

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Hello!

First actual post here, so be nice!

Here's my system specs:

CPU: i5 3570k @stock
Memory: G.Skill RipjawsX 1600Mhz 2x8GB
Mobo: Asus Sabertooth Z77
GPU1: XFX 7970 DD GHZ (or some other nonsense)
GPU2: XFX 7950 Core Edition (again, can't remember the actual model)(also these are not running in crossfire)
PSU: XFX 650W XXX Edition (what's up with these model names?)
Case: NZXT H440

Cooling:

EK 420 rad @ push
EK CPU block
Watercool 7970 block
Alphacool 7950 block
Phobya DC12-220 pump
3x Akasa 140mm fans on rad
3x Nexus 120mm fans on exhaust


I'm getting acceptable(imho) temps with this setup and I'm very pleased with the cooling as it is. If I remember correctly the GPUs never exceed 50C even at maximum load and the highest CPU temp I remember seeing was about 58C? Right now at idle the CPU temps are at 40C and Gpu is 35C. Water temp is 33C at idle and 44C at full load. Rough(taken with one sensor in one location) case ambient temp is 30 at idle and 42 at full load. Room ambient temp is about 24C. There's some background info for my question, if I forgot to mention something important just ask!

Ok, here's my question: I'm thinking of adding a 280 radiator into my loop and I'm just wondering if someone would be smart enough to determine if it would make any actual difference in the temperatures. My plan is to mount the radiator on the top exhaust slots and pulling air through the rad. If I had the money I would just buy the radiator and test it myself, but I really don't, so I know someone must know the answer or can figure something out with the information I've given.

My first thought was that if the ambient temperature is fairly close to the water temperature, and the second rad receives air that is the same temperature as the water that it's trying to cool, there would be no change in the temperature and could even make temperatures go even higher. This just sounds logical to me but I'm really not an expert at this stuff so please correct me if I'm wrong.

If this is not the case, and it would actually improve(even by a little bit or only at idle) the cooling performance, then I might just go and buy the rad and post some pictures of the results! (If posting pictures of your system is even a thing here..)


TL;DR NZXT H440 with 420 rad intake and adding 280 rad on exhaust: Is there any significant improvement in cooling performance?


Thank you for reading my post and thank you very much if you dare to reply! All off topic posts and questions are also allowed!


Edit: Of course I meant 280(or even 240), not 360, duhh.

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