Geth Posted December 4, 2013 Share Posted December 4, 2013 Hi, I've recently upgraded my CPU cooling from a year-old H80 to a new H100i system. Wanting to get the most from the parts that I have available, I've added the H80's two fans to the H100i radiator with the H100i fans ("Fan1" & "Fan2") on the bottom and the H80 fans ("Fan3" & "Fan4") on the top, all directing the exhaust upward out the top of the case. I have both pairs connected to Corsair Link through the pump and all are in the "H100i Group 1" in Link. However, in Default Mode, regardless of how fast Fan1 & Fan2 are running, Fan3 & Fan4 always spin slower by 200-500 RPM. My concern is that the top fans spinning at a slower speed may reduce the overall effectiveness and airflow. Could someone please advise how to get all four fans to run at the same speed in Default Mode in order to maximize the airflow through the radiator? Or maybe advise on a Custom Curve solution(s) that can be applied to either all fans or the separate pairs, to optimize the cooling for performance/high-load scenarios? Or does sandwiching the radiator between two pairs of fans reduce effectiveness no matter how you look at it, and should I just remove the two extras? Attached is a sample of my pump and fan speeds while running AC4: Black Flag with all graphics settings maxed out. Link to comment Share on other sites More sharing options...
wytnyt Posted December 4, 2013 Share Posted December 4, 2013 are all 4 the same fans as each brand /model fans have different tolerances Link to comment Share on other sites More sharing options...
Geth Posted December 4, 2013 Author Share Posted December 4, 2013 are all 4 the same fans as each brand /model fans have different tolerances All four fans are Corsair liquid cooling stock fans. Fan1 & Fan2 have a slightly higher max speed, as they came with this pump (I think they can do 2550 RPM). Fan3 & Fan4 are from the H80 and can do something like 2400-2500 RPM. Even when 1 & 2 reach 2400 RPM, 3 & 4 are still down around 1900 RPM. Link to comment Share on other sites More sharing options...
wytnyt Posted December 4, 2013 Share Posted December 4, 2013 you should be able to use a custom curve/setting for each fan to get them closer together but there will still be ~50 rpm difference,,at least this is what ive noticed from my builds. Link to comment Share on other sites More sharing options...
Geth Posted December 4, 2013 Author Share Posted December 4, 2013 That's what I was thinking, too. I've tried to get Link to log the fans at five seconds intervals during Black Flag to monitor how Fan1 & Fan2 react to the pump and CPU temperatures, but nothing was actually recorded in the log file other than column headers for each device that I ticked in the list for it the monitor. I don't suppose there are some pre-made custom curve settings that I could use aside from Performance Mode? Link to comment Share on other sites More sharing options...
wytnyt Posted December 4, 2013 Share Posted December 4, 2013 you should have a fixed % and fixed rpm setting to choose fan speeds along with a custom fan curve based on temps... Link to comment Share on other sites More sharing options...
Geth Posted December 4, 2013 Author Share Posted December 4, 2013 you should have a fixed % and fixed rpm setting to choose fan speeds along with a custom fan curve based on temps... How do I set fixed % and fixed RPM and a custom curve at the same time for all fans? Please explain? Link to comment Share on other sites More sharing options...
wytnyt Posted December 4, 2013 Share Posted December 4, 2013 you can look at my 3 sig pics and get an idea,use the h100i as the trigger for the fans click on a fan,look to the right at the panel thats opens up select h100i temp,then custom curve then at the bottom set your temp points do this for each fan,then run a stress test to raise temps to check heres an example of a setting you can only use one condition [custom or balanced or fixed ect...]for each fan 30 @ 700 rpm 32 @ 900 34 @ 1200 35 @ 1800 36 @ 2300 Link to comment Share on other sites More sharing options...
Geth Posted December 4, 2013 Author Share Posted December 4, 2013 That's sounds like a good idea. Thanks. Is there a stress test feature in Link or would you suggest an third-party tools for it? I only have graphics benchmark tools but the CPU seemed to just shrug those off to the GPUs last time I ran it. Link to comment Share on other sites More sharing options...
Toasted Posted December 4, 2013 Share Posted December 4, 2013 Some CPU stress programs are Prime95, IntelBurnTest, etc. Link to comment Share on other sites More sharing options...
Geth Posted December 5, 2013 Author Share Posted December 5, 2013 Ok, so I've thrown together a good custom curve with the help running IntelBurnTest (during which I'm happy to say that my rig maintained full stability with 15/16GB of RAM being devoted to the test). Thanks for the help guys :) Link to comment Share on other sites More sharing options...
wytnyt Posted December 5, 2013 Share Posted December 5, 2013 good to see you got things working for you Link to comment Share on other sites More sharing options...
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