Ok... the (almost) final part of this story. Still working on the RMA for the fourth GPU, but the rest of the system is functioning now, some notes:
- I didn't have the Reservoir connections set up correctly, so it was trying to use only one pump while the other spun its wheels and did nothing. Explains why it was making noise. There is now a drastic difference in the amount of flow seen in the reservoir and the tubing. In fact, the most notable part about this is that the reservoir looks like its churning like hell in there, when it was almost standing still before.
- I had the flow frequency meter installed backwards, so it was reporting 0 to the tachometer values in the OS. whoopsie
- The fans being connected to the CPU fan ports on this Rampage IV Extreme wouldn't slow down when they weren't needed for quieter 24/7 operation. After a lot of trial and error (mobo Q-Fan, SpeedFan, Asus AI Suite, etc wouldn't work) I just moved the connections to the Chassis Fan X and Optional Fan X ports, there I'm able to control the speeds with Asus AI Suite, primarily they just run at 50% now and don't change (because the system never heats up even under load )
- I did some overclocking and found that I am in no way hindered by Thermal values anymore with the CPU or GPUs. I am still however limited by general chip instabilities. See below for the list of values I was able to set in the system.
i7-3930K (3.2 GHz) running at 4.6 GHz and 51C under load, 28C idleGPUs:
EVGA nVidia GTX 680 4 GB (Standard, not factory OC) default clocks of Core 1124 MHz Memory 3000 MHz with now a Core +140 MHz and Memory +375 MHz, they don't get above 46C under Heaven load and do 28C idle
Heaven Score for max settings in 5760x1080: 520 (FPS 20.7)
3DMark11 X Score: X8986 (I had one over 9000!)