OK, there is a lot of info here, so I hope it's not too much.
Build: msi C8r (Carbon8r)
Core i7-9700K, MSI Z390 GAMING PRO CARBON Mobo, AMD Radeon VII GPU, Corsair Vengeance RGB 32GB DDR4-3200 RAM, Phanteks Enthoo Pro M SE ATX Case.
XSPC RayStorm Pro CPU w/b, Bykski Radeon VII GPU w/b, EKWB 140 Revo D5 RGB Pump & Res.
Aquacomputer Aquaero 6 LT USB Fan-Controller, Vision Touch and 'High Flow' Sensor.
(2x) HwLabs Black Ice Nemesis 280GTS XFLOW radiators in full push/pull with 6x Deepcool CF 140mm & 2x Prolimatech 140mm Slim Fans.
My I7-9700K CPU is OC to 4.9Ghz and my Radeon VII is OC to 1950Ghz (memory 1200Mhz).
My idea for the build was a fast and powerful Gaming PC / Workstation with silent performance. I chose the Deepcool CF140 fans because the moved a lot of air, were quiet, had aRGB, and were less than half the price of Corsair ML140's. Unfortunately, their static pressure is not the best.
Fan Speed 500±200 -1200±10%RPM
Fan Air Flo 64.13CFM
Fan Air Pressure 1.09mmH2O
Fan Noise Level 19.8~24dB(A)
I accidently purchased two HwLabs Black Ice Nemesis 280GTS XFLOW radiators instead of one. After reading the reviews for these rads, I sent back the XSPC EX280 rad I had planned on using up top.
According to this review (https://www.xtremerigs.net/2016/02/19/13271/5/
) these combined radiators should be able to handle (theoretically) the following heat loads at 10c over ambient:
Push/Pull @ 750 rpm = 400 watts
Push/Pull @ 1300 rpm = 600 watts
Push/Pull @ 1850 rpm = 700 watts
In my original air flow configuration I had the Front Rad on intake and the Top Rad on Exhaust. I also had the rear fan on Intake to get additional cooling on the memory and VRMs and also give the Top Rad a boost.
See Original Airflow.jpg
During a sustained heat load stress test my CPU maintained about 75c Max and GPU Hot Spot hovered around 80c. My Loop Delta T was running about 18c to 19c with an ambient of 26c. Loop was running around 45c to 46c. When gaming I was typically in the 16c area.
After reading several different forum posts (some here on OC) about re-orienting your radiators for all Intake, I started to realize that the argument was valid. (The phrase "Radiators love Fresh Air" stuck in my mind).
I tested it out by taking my glass off the case and using cardboard redirected the warm exhaust from the front rad, allowing much cooler air to enter the top rad. As soon as the temps equalized I could see the case was running at least 3c to 4c cooler.
As soon as I had a free weekend, I tore down the top of my case and flipped all the fans around. I also flipped the Rear Intake to a Rear Exhaust. While the loop was down I also repasted the blocks with TG Kryonaut to ensure good contact.
See Optimal Airflow.jpg
I also added a leftover Deepcool CF120 fan I had as exhaust. I did not want to just tie wrap this on. I had extra bar magnets from Amazon, stuck them on the sides with really good 3M double sided tape (on three sides of the fan) and popped the fan over the Open Pcie slots (4). It fit surprisingly well and can be removed as needed. I even put a little flap at the top to better force the fan to pull the air from the case.
See pics below.
In re-running the sustained heat load stress tests my CPU maintained about 67c Max and GPU Hot Spot hovered around 70c. My Loop Delta T was running about 13c to 14c with an ambient of 26c. Loop was running under 40c. When gaming I am typically running around 11C. Overall, I was very happy with the improvement.
***So, with the whole picture laid out my question is: How much will an external 140mm Radiator help in providing additional cooling for my Phanteks Pro M SE at this point?***
Keep in mind, the rad is going to be on the Exhaust this time AND it will be the LAST rad to get the coolant, so I am not expecting optimal cooling here.
I haven't purchased the radiator but will go with the Alphacool NexXxoS XT45 Full Copper X-Flow 280mm radiator. I can drain this, add a bleed valve and a temp sensor to the extra ports.
I have all the other spare parts I need and I can hang the 140 fairly easily (only a little modding for tubing holes). My only cost will be the radiator.
It will be in Push/Pull config with leftover 2x Phanteks PH-F140MP RADIATOR FAN (Better SP than the Deepcool)
If I can drop the Loop temp down another 1c I would be happy with that.
Also, the plan is that eventually I mount another pump outside the case for redundancy and to improve flow. At 100% my loop was just under 1 GPM, however, I usually run my pump at a steady 90%. Another pump would be useful. The 140 crossflow radiator will allow me connect the pump to the loop easily.
Thanks for reading and let me know what you think.