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After seeing some of the heat outputs my components are giving me, I decided to take the leap to water cooling (and also the more overclocking, the better!). But right now I'm somewhat stuck on the components. The layout I have appears to be fine, but I'm more worried on some of the components and their affects, specifically flow rate, air movement within my case, and if the cooling power of my planned setup would allow for even more overclocking.

My setup components are made up of a single MCR320 Rad with the pump (MCP35X) with the 3 inlets, an MCR220 XP without pump, an Apogee HD water block, two EVGA GTX 580 Hydro Copper water blocks, and an EK Rampage III Extreme motherboard water block. My fans for this setup would be 120mm SickleFlow 2000 RPM (70 CFM), while this entire setup would be mounted within a HAF 932 case. Other components would be a T-style shutoff valve and Hydrx used as the coolant additive.

Flow path would be:

MCR320>Pump>MCR220>Apogee HD>EK Block>MCR320
>GTX 580 Block>MCR320
>GTX 580 Block>MCR320

In this setup, I would be taking full advantage of all of the Apogee's ports, and using it as a splitter instead of a separate component filling that role. The GTX 580s would be on the two side outputs of the Apogee HD (versus incoming water) and the EK block would be on the far end of the Apogee, causing it to take the warmer water instead of the GPUs (in theory). The triple radiator would be mounted on the underside of the top of the case and the double radiator would be mounted on the side just above the PSU.

Now onto the worries. The pump is the first one. Is the pump powerful enough to move the coolant at a faster speed than 0.8 GPM? This appears to be one of the minimum flow rates around the internet that people are using (or maybe I've just been looking at the wrong websites!).

Second worry is about tubing ID. Should this be 1/2" around the entire loop or should this be different? I'm thinking this would cause a massive pressure drop around the Apogee block because the water would be cut into three paths, but is this really a problem as all the components off of the Apogee lead directly into the same radiator, hopefully returning the pressure to the same levels. Also another tubing setup would be having 5/8" ID going between the two radiators and into the Apogee and having 1/2" leading out of the Apogee and back into the radiator.

Third concern is about air flow within the case. My case is a HAF 932, which has a large amount of vents and places to put fans. I would be turning the front fan in the case around to blow air out, but its CFM coupled with the back fans CFM (in total, it could be 135 or 210 according to estimates) is not nearly enough to be equal with 5 Sickleflows (350 CFM), if they all blow in. I did however buy one additional Sickleflow which could be positioned on any remain vents in the case, including an extra drive bay (two would be filled up by the DVD player/burner and by the triple radiator) or one on the side below the radiator or possibly on the bottom if I have enough room, which would bring the outbound CFM to 205 or to 280 (note that I have no idea how much air the PSU moves through it, and that it is positioned on the bottom of the case).

The question is how should all the fans be blowing in? I've heard to always push air through a radiator, never pull, forcing the triple radiator on top to blow in, while the side radiator could blow in or out, but I'm not interested in recycling air from one radiator into the other. My current idea would for all the rads to be pushing air into the case while all other fans would be pushing air out, but if anyone has a different idea please tell me.

Forth (and final) concern is would this be enough cooling power? My CPU at full load runs at 83 degrees Celsius on the hottest core (without hyperthreading!) at 1.3 core voltage and my GPUs touch 80 degrees at 1.113 volts. With these current temperatures would my overclocking still be limited or would I have much more freedom? Or in other words, how much should I expect my temperatures to go down. I could buy another radiator if necessary.

Also I have never found a similar watercooling setup on the internet (did I not try hard enough?) but there's bound to be someone with a similar rig, especially somebody who used the Apogee's multiple port function.

All information is appreciated, and thanks in advance.