Better fans, worse results.
I wasn't really happy with the results I was getting with my watercooling setup (they weren't bad, but they weren't what I expected), so I did a little research, and it turns out the fans I was using on my radiator were very low power (less than 40 cfm), so I replaced them with some that have almost 120 cfm. I have two external triple radiators, one for the CPU/chipset, and one for the GPUs. In order to do a little side-by-side testing, I left the old fans on the GPU loop; the first thing I did was put my hand over the fans on each radiator... the new ones seemed to put out less air. Eh, I'm just imagining things, I thought. Then I did a batch of LinX, and the temps are actually worse.
I'm wondering if the problem is that my fan controller is overloaded. I have six fans on my radiators, and only five channels on my fan controller, so what I'm doing is daisy-chaining them into two channels, one for each radiator. This seemed to work pretty well with the old fans; the controller showed a consistent 1000 RPM for each channel, which is right around where the fans are rated (I think the manufacturer said 1100 max). With the new ones on the CPU loop, each channel, both old and new fans, are showing inconsistent numbers which dip up and down, maxing out at 1000 RPM. Here's the strange thing; the new fans are rated at max 4250 RPM. So it appears that the new ones are only operating at 1/4 capacity.
Any ideas? Again, my gut instinct is that the new fans are drawing too much power for just a single channel, but I have no way of dedicating a single channel to each fan.
Case: Cooler Master HAF X RC-942-KKN1
Power Supply: Silverstone ST1500 1500W
Motherboard: Asus Rampage IV Extreme; CPU: i7-3970; Memory: Corsair Dominator Platinum 32GB @ 2133MHz
Graphics Card: HD7970
Optical: 2 x Lite-On iHAS424SATA 24X DVD
Hard Drive: OCZ RevoDrive 3 X 2 240 GB
Monitor: Samsung 1080P 120Hz 3D